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A STUDY OF THE PATTERN OF HEADWAYS
ON AN URBAN FREEWAY
I
CANQ VO
I 224 la Voirie
i Québec Jean-Luc Simard, B.A,Ing.P, B.Sc.A,M.Sc.A.
da Ingénieur en circulation
THE UNIVERSITY OF TORONTO LIBRARY
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Ministère des Transports Centre de documentation 700, boul. René-Lévesque Est, 21e étage Québec (Québec) G1R 5H1
:1 V;o111'. Cédr
,
„ett.th
A STUDY- OF THE PATTERN OF HEADWAYS
ON AN URBAN IeREEWAY
by
J. L. SIMARD Reçu CEflt 4Ett'OCWEfirfAT/ON
DEC 4 1980
TRAOSPOTS QUÉBEC
A thesis submitted in partial fulfillment
of the requirements for the degree of
Master of Applied Science in Civil Engineering
in the Faculty of Civil Engineering,
at the University of Toronto, Ontario
August 1962
ACKNOWLEDGYŒNTS
The author of this thesis is very much indebted to
the Canadian GOod Roads Association whose sponsorship enabled
him to carry out this study und to the Quebec Department of
Roads, especially their Chief Engineer, Mi'. Arthur Branchand,
and their Chief Traffic Engineer, Mi'. Henri Perron, for
granting him a full year leave of absence in order that the
work might be completed.
Special acknowledgments are due to: Professor M. M.
Davis who as director of this project provided mudà valuable
information and assistance and also reviewed the thesis; Mi'..
W. Q. Macnee, the chief Traffic Engineer of the Department
of Highways of Ontario, for supplying the photographie
equipment and the films from which the data involved in this
thesis have been extracted; Mi'. J. L. Vardon, Planning
Engineer in the same Department, for his comments and
assistance; Mr. R. Wormleighton, professor in the Faculty
of Mathematics at the University of Toronto, for his advice
in statistical nattera; •the authorts wife, Suzanne, for her
invaluable assistance in extracting the data from the films.
TABW OF CONTENTS
Chapter Page
ACKNOWLEDGMENTS ii
LIST OF TABLES
LIST OF FIGURES vi
I. INTRODUCTION 1
H. EXPERIMENTAL,PROCEDURE 3 The field equipment 3 The projection -equipment 5 The study locations .. 8 Extraction of data 14
III. EXPERIMENTAL RESULTS 18 The concept of headway 18 The Poisson formula 20 Samples . . 28 Sample means and variances 29 Hourly volumes 30 Qbserved Headways 30 The Erlang Distribution 38 Nature of the Erlang Distribution 40 Test of Goodness of fit . 44 Simulation by parallel arrangement 49 Relation of parameter K to volume 53 Relation of parameter K to type of lane . 58
IV. " CONCLUSIONS . . '69:
APPENDIX "A" - Tables of observed and theoretical distributions of Headways at ail study locations 73
APPENDIX "B" - Curves of observed and theoretical distributions of Headways at ail study locations
APPENDIX "C" - Curves (plotted on semi-log paper) of observed and: theoretical distributions of Headways at ail study locations 107
90
Table of Contents continued
APPENbIX "D" - Tables of chi-square tests when fitting observed data to Poisson and Erlang (K=2) distributions 124
REFERENCES 157
LIST OF TABLES
Table No.
Pace
Summary of
Summary of variances,
the projected Hourly volumes 15
calculated sample means, sample hourly volumes and Of ............ 31
Summary of chi-square test results
L. Classifiction of K values in relation to types of lane and study locations ... . 59
General analysis of variance table. Two-way classification with interaction ......... 60
Analysis of variance table. Ah l three types of lane included 61
,Classification of K values in relation to study locations and two types of lane only .. 63
8. Analysis of variance table. Passing lane • excluded 64
A-1 to A-16. Theoretical and Observed Distribution of Headways at ail individual study locations ...... 73-89
D-1 to D-32. Chi-Square Tests for ail individual study locations when fittïng data to Poisson and Erlang (K=2) .. 124156
I
I
ILIST OF FIGURES
I Figure Nod Page
I 1. Arriflex 16 m.m. camera used to obtain
the data • • 4
I2. Tower from which the films were taken .....
3. Pro jector used to take the data from the films .. ... 7
I 4.
... Sketch showing the general location of the reference line •• • • • • • ••• •• • • 10
I 5. Sketch showing the study locations 11
I
6. Typical traffic volumes obtained from automatic traffic recordera .. 13
7. A typical headway distribution curve 22
.0bserved distribution of headways in a driving lane; Dufferin Street . 23
Observed distribution of headways in a passing lane; Islington Avenue .. 24
I 10. Observed distribution of headways in a deceleration lane; Dixon Road . 25
I 11. Observed distribution of headways in
through lanes combined; Avenue Road . . 26
I 12. Erlang arrivai or service-time distribution.
Probability that the next arrivai will occur after time interval t 39
I 13. Family of arrivai distributions correspond- ing to a parallel arrangement of exponential channels ... .. • • •• • . 51
I 14. Influence of lane volume on parameter K 56
I 15. Influence of total volume of combined
through lanes on parameter K . . 57
I vi
List of Figures continued
B-1 to B-16 Theoretical and Observed Distribution of Headways at ail individual study locations 90-106
C-1 to C-16 Theoretical and Observed Distribution of Headways (plotted on semi-log paper) at ail individual locations 107-123
vii
I. INTRODUCTION
The purpose of this thesis was to study the
longitudinal distribution of vehicles in the traffic stream.
In respect of roads with small volumes of traffic, we knew
that a good approach to the problem may be dotained by
assuming that the traffic is fortuitously distributed and
follows closely enough a quite- simple probability function
named Poisson distribution (3).
However, because of the nature of the Poisson
formula ald the way it has been derived, we had serious
doubts that it would not work as well for average or
relatively high traffic volumes. Since ail the traffic
theory regarding the longitudinal pattern of the traffic
flow is based on this function, we thought that it was very
worthwhile to check its accuracy at different volumes and
possibly determine the conditions for which it applies.
At high volumes, the traffic is not as fortuitously
dis tributed as in the case of low volumes sLnce there are
so many factors influencing the driver operation that we no
longer have this complete randomness upon which the Poisson
function is based. In these conditions, it was felt that
another mathematical tool was needed which was not based on
this "complete randomness". This tool should possibly work
-1-
2
for either the opposite extreme from randomness which is
reguIarity and can be nearly approached during congestion,
or for the whole range of possibilities between randomness
and regularity.
A. K. Erlang (5) has developed such a distribution
and used it to describe telephone traffic. The Erlang
distribution is "less random" than the Poisson distribution
in the sense that it predicts a more regular and determined
flow than the latter. Since -We expected. to observe a
relative regularity of the traffic flow at high volumes,
the Erlang function might possibly work. Furthermore,
there might be such an analogy between road traffic and:
telephone.. traffic that we could possibly apply to road
traffic the theory as developed in telephone by A. K.
Erlang.
II. EXPERIEENTAL PROCEDURE
THE FIELD EQUIPMENT
The data upon which we based our calculations
have been extracted from some films tàken by the Dept. of
Highways of Ontario in previous studies.
The camera used to tale the films was an rArriflex"
16. m.m. professional cine camera, see Fig. No. 1. Although
it was equipped with wide-angle, telescopic and normal lenses,
-0/ily the normal ions was used.. It was also powered by a
storage battery and the frame speed could be set at any
given speed by a quick adjustment. A small amount of
experimenting showed that a speed of eight frames per
second would give the best results as far as the number of
vehicles observed per'length of film and the movement of a
particular vehicle in any one frme are.concerned.
The film spools contained approximately 400 feet
of film which produced approximetely thirty minutes of film
without changing spools. Although it would have been
desirable to have no interruptions in filming during this
period, it was occasionally necessery to stop the camera
to meke speed adjustments. Filking was aLso stopped if
traffio came to a stop either on the through lanes or on
the deceleration lame. This stop condition contributed
-3-
» Arriflex 16 mm. 'camera used to obtain the data
FIGURE 1
nothing to the study and in ail cases the Cause was beyond
the camera range and therefore of no interest in this
study.
To obtain the required field of view, the camera
was located on a touer constructed of portable tubular steel
scaffolding (Fig. No. 2). The touer was approximately fifty
feet high and guys were used to minimize swaying. The
distance between the touer and the nearest lane of the
highway was in the vicinity of 100 feet. The touer was
plainly visible to the motorists, particularly when it was
manned. In order to minimize any effect on the habits of
the drivers, it was in place approximately one week before
any camera work was carried out. Personnel also moved
around at the top of the tower during this familiarization
period. As far as could be determined, the touer had no
effect on the operating characteristics of the vehicles
on the through lanes or on the ramp.
THE PROJECTION EQUIPMENT
The projector used for this phase of the study
was a Bell end Howell 16 m.m. suent time and motion study
type (àee Fig. No. 3). The film could be run forward,
reversed or stopped at any time. The projector was
specially fitted for manual frame advancement for detailed
examination of each individual frame of the film. A counter
Tower from which the films were taken
6
FIGURE 2
JUN • 62
i Abe • alifflimiuren.
Projector used to extract data from the films
7
FIGURE 3
was attached to the projector for recording the number of
frames which had been viewed between the passage of successive
vehicles. The projector was equipped with a normal
projection lens with a focal length of 2 inches and required
a projector distance of about 20 feet to obtain a picture
size of 4 X 3 ft.
THE STUDY LOCATIONS
Although the Dept. of Highways of Ontario had a
great number of films available which had been taken in
previous studies, maay of them could not be used for the
purAse of this work for some reason or another. One of
the major reasons preventing their use was in most cases
due to the fact that it was often extremely difficult to
determine with a reasonable accuracy the precise instant
when the oncoming vehicles reached a reference une drawn
on the screen for the purpose of calculating the headways.
Most of the films having indeed been taken at intersections
for specific ramp studies, our reference une was often
located so far in the field of vision as to make accurate
determinat ion of the instant that a given part of any
particular vehicle crossed the une practically impossible.
Another reason which prevented their use was that on many
films the field of vision was so small that it did not
show a point approximately halfway between the beginning of
the full width of the deceleration lane and the island nose,
which was the location where we referenced the vehicles.
Fig. No. 4 is a sketch showing the general location of the
reference limé. Ideally, we would have liked to reference
the vehicles before they reach the taper section of the
deceleration lane, but no film provided us with this
opportunity. In order that ours data reflect the existing
conditbns of the traffic flow, we had to locate our
reference line before the nose of each intersection so
that we take an account of the vehicles using the
deceleration lane; we had to reference them also at a point
far aaough from the beginning of the deceleration lane so
that the through traffic previously influenced by the
vehicles using the deceleration lane would be given enough
time to readjust their operation as if they had not been
influenced by the former.
After examination of ail the films that were
available, four films were finally selected for longitudinal
movement analysis. Ah l films show major intersections with
the Highway #401, an urban freeway in the northern part of
Metropolitan Toronto. Figure No. 5 is a sketch showing
the study locations. To simplify the naming of the sites
throughout the rest of the thesis they will be called only
by the nome of the street which intersects Highway en.
REFERENCE UNE
ISLAND NOSE DECELERAT10N LANE -
_LDRIVING LANE
IPASSING LANE
MINI MI Mill MINI RIB BIBI MM MI MIR IIIIIII 111111 111111 Mil MI MM Mill MINI
SKETCH SHOWING THE GENERAL LOCATION OF THE REFERENCE LINE
FIGURE
ISLINGTON AVE
0
0
0 >c
k I PL, !NIG AVE
Sketch Showing The Study Locations
FIGURE
12
While each intersection has a different layout, this was not
taken into consideration in oui' study since the longitudinal
movement of vehicles which we study is not influenced by
the intersection layout. Each intersection is in flat
terrain and the geometric features of both the inter-
changes and the highway at each location have the same
standard level of design so that neither the geometric
design of the highway nor the physical nature of the
highway have any effect on the spacing of vehicles at any
particular location.
_The Annual Average Daily Traffic volume at these
locations as determined by the Ontario Department of
Highways was reported as being between 36,000 and 67,000
vehicles per day for both directions of travel. Some
typical traffic volumes taken at each location with
portable automatic traffic recorders are shown in Fig. No.
6; these volumes have been recorded during one week just
prior to the filming. The highway was originally designed
as a rural freeway, but due to its proximity to Toronto and
the large volumes of traffic, it can be classed more
accurately as an urban freeway.
Ah l the films used in this study were taken
during that period of Ume when there was the greatest
combination of through and diverging traffic. This
happened from 7:30 a.m. to 8:30 a.m. for westbound traffic
c0 O' zj-
e <4 •=4 a a a GO C>
N- cc as
pi
If\
il••••••
HDecelerationLane 2 Through
14.00
300 200
100
O
4.11.
NO.«
-h Pi P-4 Pi
111 N-- c0
Lanes
1600 0.4.• 1200
L. 800 -
400
0
<4 2-4 Pi
o• _I- Ir\ • .o
600_____
500 400
300L
200,
100'
0
z ‹
z Z. zP-4 P-I P-I <4 <4
Z Pi
N- c0 Cl` 4- Ir\ N- 00 0% _..-
ISLINGTON AVENUE tr) 700 600
500
11- 00
300
200
100
DUFFERIN STREET
DIXON ROAD
Tif
2400
2000 1600
1200
800
400
o
2800 2400
2000
1600
1200
800
400
0
2800 2400
2000
1600
1200
800
14. 0 0
O
EQ
UIV
AL
EN
T H
OU
R LY
VO
LUM
ES
1
P-4 Pi
c0
o
700 600
50Ô
1400
300
200
100
o
AVENUE ROAD
FIGUE 6: TYPICAL TRAFWIC VOLUMES OBTAIN.b1) PROM AUTOMATIC TRAFFIC RECORDERS
on Highway #401 and from 4:30 p.m.to 5:30 p.m. for eastbound
traffic. Although it might have been preferable that the
films be taken at different periods of the day in order to
deal with the greatest range of traffic volumes, we feel
that the volumes obtained for each individual lane at each
intersection provided us with a range of volumes good anough
for the purpose of this thesis. Table No. 1 shows these
hourly volumes projected in each case from our population
samples. In other words we think that the volumes of
traffic which were analysed show anough variations so as
to serve our purpose of studying the longitudinal flow
pattern of traffic at different volumes.
EXTRACTION: OF DATA.
Our work consisted of observing at each location
the headways in individual lanes and in the two combined
through lanes. Although the method used was very tedious
and required a considerable period of time, it was very
simple. It consisted of turning the projectOr manually
until the right front tire of a vehicle waà approximately
even with our screen reference line and then of recarding
the corresponding Crame number. Knowing the camera speed,
which in our case was always 8 Crames per second the
headways cou1d be simply obtained by subtracting the
consecutive dounter readings and then dividing by the.
MI Mal »I 11•11 MEI 111111 111•11 MI MI MI 11111111 MIR MM Mill IBM
TABLE NO. 1
SUMMARY OF THE PROJECTED HOURLY VOLUMES (IN VPH)
LOCATION DriIVING LANE PASSIN2T LANE DEC ,7T,ERATION LANE TOTAL ALL LAUES
DIXON RD. 460 658 846 1964
ISLINGTON AVE. 562 1096 674 2332
DUFFERIN ST. 950 1614 328 2892
AVENUE RD. 852 1788 622 3262
16
Camera speed, which was 8 frames per second— We fellowed the
saine method for the four study locations. At each location,
we ran the 'film three times, first recarding simultaneouely
the headways of both the driving and passing , through lm es,
secondly recording the deceleration lane headways and
thirdly recording the headways for the two combined through
lanes.
At first, we recorded the headways for periods
of fifteen minutes, which was approximately half of the film
spools, and when headways for each lane had been recorded,
we automatically reren the film in its entire length, which
corresponded approximately to a period of time of thirty
(30) minutes; this turne counting the vehicles in each lane.
The next step was to project these volumes to hourly volumes
by assuming a linear relation which we felt would be
accurate enough since the filming having been done at peak
hours, the volumes of traffic observed were so heavy and
the traffic flow so regular as to assume the saine regularity
for the second half hour. This has proved to be true at a
later stage of this thesis when we decided to reduce out"
s amples to 200 vehic les to simplify the calculations and we
found negligible differences between the volumes projected
from the time corresponding to the first 200 headways and
those projected from the volumes observed during the entire
length of the spools. The headway sam.-oie means calculated
17.
from both sets of data also showed negligible differences.
Therefore, we have gocd reasons to affirm that the estimated
hourly volumes projected from our sample means closely
represent the existing hourly volumes at the tue of filming.
In any future similar type of study, we would recommend
that traffic counts be taken at the tue of filming so as
to Sive an opportunity ta check the estimated figures.
III. EXPERIMNTAL RESULTS
THE CONCEPT OF HEADWAY
The longitudinal pattern of traffic flow can best
be analysed by the measurement and examination of the gaps
between vehicles. But this can be done in several ways
One way is to measure the distance in feet between vehicles.
Another way is to masure the distance from the beginning
of one vehicle to the beginning of the next vehicle. In
either case, individuel or average spacings between
vehicles can be determined. However, from observation, it
has been found that the minimum or ildesirable" spacing
(i.e. the distance to the vehicle ahead that the motorist
accepts as a safe distance so that he will have enough
time to react in case of emergency) varies as some function
of the velocity at which the vehicles are travelling.
Thus while a distance of 50 feet to the preceding vehicle
may be acceptable at a speed of twenty Cive miles per hour,
the motorist would no doubt prefer a greater distance if his
speed is sixty miles per hour. Therefore we can see that
it is not suf fiole nt to compare the spacings of vehicles in
terms of linear distances without cons idering al so the
vehicle speeds.
-18-
19
A more convenient method to measure these gaps is
in ternis of units of tue rather than distance, the second
being the usuel unit used. The elapsed tue from the passing
> of the front (or any other part) of a vehicle past a fixed
point until the sanie part of the next vehicle passes. the
sanie point is termed a "head.way". The examination of
head.ways in a traffic stream does not have to be correlated
with speed.s since a desirable headway does not vary much
with speed. The variation of- d.esirable head.way as related
to variation of speed is very small end can be neglected.
Another reason why the "headway" concept hes to be preferred
to- a linéar spacing concept in stream analysis is that while
the latter is a direct measure of traffic d.ensity, the
head.way is a direct measure of the rate of traffic flow,
which is .easier to determine and. at a lower cost than the
traffic density. Therefore, this concept has been used
through.out the length of this thesis.
A study conducted by O. K. Norman, of which thé
main results have been summarized in Figure 7-6 of TraffiC
Engineering by Matson, Smith and Hurd (7) s.uggests that a
head.way greater than fine (9) seconds is c.cnsidered to mean
that the following vehicle is operating in a free flow
condition and is not influenced by the vehicle ahead.. For
head.ways stnaller than nine (9) seconds, the a.bsolute speed
of the rear vehicle begins to fall rapidly to approach the
20
speed of the vehicle ahead, and there a marked drop in the
relative sbeed of the first and trailing vehicles, thus
indicating that the trailing vehicles adjust their speed
to the leading vehicle, and therefore that the former is
operating under restricted flow conditions. The preceding
vehicle is considered to exert some influence over the
behaviour of the following vehicle.
Although we expected to observe in our study a
great number of headways smaIler than nine (9) seconds,
thus losing that "complete randomness" upon which ail the
theory of probability and statis tics is based, we decided
that a statistical approach was justified since we felt
that there still was left in our traffic stream a certain
degree of undetermination and randomness. Furthermore, this
was our main objective to find out where a statistical
approach could be applied or at what point sudà an approach
ceased to be realistic.
THE POISSON FORMULA
Previous observations have shown that the distri-
bution of headways in a traffic stream does not display a
central tendency about the mean, i.e. is net a "normal"
distribution in à statistical sense. The experience bas
shown that most of the drivers tend to travel at headways
less than average while only a féw drivers exceed the
21
average value, usually by a much larger amount. Fig. No. 7
is a typical headway distribution curve. This suggests that
the headway distribution might follow the function derived
from probability laws known as trie Poisson distribution. If
we examine our own data for one of each type of lanes
studied (see Fig. 8, 9, 10, 11), it becanes readily apparent
that the resulting curves have approximately the same shape
as the previous typical headway distribution. It seemed
therefore reasonable to analyse in more detail our experi-
mental observations, even if it was known that theoretical
and observed results would not coincide exactly.
The Poisson distribution is given by:
-M x M P(x) - xl (1)
where P(X) = thejprobability of x events occurring. x = 1,2,.....n.
m = the expected number of events occurring on any given observation, i.e. the mean of x,
(x) or 7 = m.
e = the base of Naperian logarithms = 2.71828.
Applied to traffic, the definition of terms
becomes:
P(X) = probability of the arrivai of x vehicles at a point during a given length of turne.
m = mean number of vehicles arriving in the given length of turne = tV .
3.65-6
t = given time length of gap (sec.)
MI Mal MM 11•11 MI lila Mil MINI MIR MI IBM IIMI MI Mill MIR MI
PER CENT OF TOTAL VEHICLE S TRAVELLING AT
IMIMP
Mar
1_i Ii IlinniniTiT1 I I rrni t t 10 15 20 25 30 35 14.0 45 rs.)
H EADWAY - SECONDS
FIGURE 7: A TYP ICAL HEADWAY DISTRIBUTION CURVE
MI MI MI 11•1 IBM WIN Mill 111•1 MI IBM Mil IBM »I MIR MM Mill MM AT
GI
V4N
1 11.:;11 f
eiA
Y
10 11 12 13 14 15 HEADWAY SECONDS
FIGURE 8: OBSERVED DISTRIBUTION OF HEADWAYS IN A'DRIVING LANE (DUItFERIN STREET) \--)
MB MB MI 111111 Mn Mil MM 11111 MIN 11•11 11311 Inn MI 111111 an Inn MB
CENT OF TOTAL VERICLES TRAVELLIN G AT UVEN HEADWAY
50
30 _
20 _
10
0 1 2 3 14 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 HEADWAY - SECONDS
FIGURE 9: OBSERVED DISTRIBUTION OF HEADWAYS IN A PASSING LANE (ISLINGTON AVENUE)
Mil MI ail MI MI IIIMI IIIIIII MIN MM MI MI 1111111 OIS Mlle MI Mil MI IBM
9 10 11 12 13 114. 15 16 17 18 HEA.DWAY - SECONDS
FIGURE 10: OBSERVED DISTRIBUTION OF HEADWAYS IN À DECELERATION LANE (DIXON ROAD)
lm am am me oui mi mi mi mi lm lm am am am mur lm sa lm mi
1-1 L. 5 6 7 HEADWAY --.SECONDS
9 10 •
FIGURE 11: OBSERVED DISTRIBUTION OF HEADWAYS IN THROUGH LA:ES COl'IBINED (AVENUE ROAD)
27
V = hourly volume in VPH.
If the hourly volume is not known, m =
where x = the'average of observed headways. Since a
headway corresponds to a period of time during Which no
vehicle arrives, substituting zero (0) to x in the above.
formula (1) gives:
P(0) = e-mm° = e-m (2) 01
which may be interpreted as the probability of occurrence
of headways equal to or greater than a selected time t.
Following What was mentioned above, formula (2) can be
written in two different ways, as,follows:
e-vt/3600 (3)
where P(t) = the probability of occurrence of a headway greater than t seconds
and V and t are defined as above;
or P(t) = e-t/7 (4)
where P(t), t,, ead 7 are defined as previously.
Since the hourly volumes were not known at the
Ume of computations, we used formula (4) rather than
formula (3) but we would have obtained the sanie results
in using the latter since the hourly volumes have been
based upon the headway sample means and since (as previously
stated) the proportion between their Ume of observation
and the hourly volume was a linear one.
SAMPLES
As previously mentioned, when we began extr.acting
the data with the projector pur samples were drawn from a
film running turne of approximately ha1f a film spool or 15
minutes. The result was that our sample varied from lane
to lane and from location to location, since we dealt with
different volumes during the same elapsed period of turne.
At a later stage however we realized that using a constant
sample would greatly simplify the calculations and make them
less tedious. Therefore, instead of drawing our sample
from a constant time of observation, we observed a constant
number of cars, no matter what was the elapsed turne of
observation. We felt thata sample of 200 cars would be
sufficient to obtain a statistically stable sample and
therefore decided to analyse this sample at each location.
This sample stability was well damonstrated since we
obtatned approximately the saine hourly volumes and the saine
sample means when we calculated them using in ell cases.the
two sets of samples.
28
SAMTLE MEANS AND VARIANCES
There were two ways to calculate the sample mean.
One was to observe ail headways of our saoules, sum them up
and then divide by the total number of observed headways,
which in our case was 200. Since this method required that
we knew the exact value of each headway, it was rejected
since it involved a cons iderable amount of calculations
If we consider that we had to study a total of. sixteen (16)
samples, each one involving two hundred (200) figures.
Another one was to divide the total time of observation by
the number of vehicles observed. This method, much simpler
than the latter, was used. The total time of observation
could be easily calculated by recording the frame nuMber
corresponding to the two hundredth (200TH) vehicle and then
dividing by.the camera speed (8 Crames per second). If we
let Y = the frame number corresponding to the passage of
the 200th car, the sample mean is given by:
TOTAL TIME OF OBSERVATION = y = y
7 - TOTAL NUMBER OF OBSERVED VEHICLES 8 x 200 1600 e
The sample mean 7 being knawn for each set of
data, the sample variance S2 could easily be obtaîned by
using the well known formula:
s2 = r (Xi-)2 fi 1-1 n-1
where S2 = the sample variance
29
30
= the sample mean
K = the number of cells
xi = the cell midpoints
fi = the cell frequencies
n = the total number of observations = I. fi = 200 1=1
HOURLY VOLUMES
The hourly. Volumes pro jected from our samples
have been obtained as follows:
Hourly vOlume = No.of observed headways x camera speed x 3600 4. Prame number corresponding to the 200thvehicle
= 200 x 8 x 3600 1, Y
As we noted earlier, we have good reasons to belleve
that the'theoretical hourly volumes calculated by the above
formula coincide clos ely with the actual volumes which would
have been recorded, had we counted the traffic volumes during
one hour at the time of the filming. Table No. 2 gives 'a
summary of the calculated sampie meals sample variances
and hourly volumes for each individual lane and through
lanes combined,
OBSERVED HEADWAYS
Having a mathematical tool to work with, it is now
possible to examine the data obtained in the present thesis
MI MM MOI MI Mal NUI MM MB Mil IBM MW Mil MB MI 11111 MB 'MI
TABLF, NO. 2.
SUMMARY OF CALCULATED SANPLE Prq1 ANS (7), SAMPLE VARIANCES (S2 ), HOURLY VOLUMES AND 1/5E.
LOCATION TYPE OF LANE
SAMPLE
i'r ee)
1 SAMPLE VARIANCE(S2 )
HOURLY VOLUME(VHP) x
DRIVI7G 7.85 0.127 30.16 460 DIXON ROAD PASSING 5.48 0.182 32.18 658 DECELERATION 4.26 0.235 16.72 8116
DRIVIE'l 6.42 0.156 17.96 562 ISLINGTON AVE. PASSING 3.28 0.305 9.78 1096 DECELERATION 5 .3 5 0.187 , 28 . 53 674
DRIVING 3.80 0.263 6.45 950 DUFPERIN ST. PASSING 2.23 0.)1118 1.64 DECELERATION 10.97 0.091 102.32 Il
%
DRIVING 4.23 0.236 8.97 852 AVENUE ROAD PASSIN 2.01 0.498 1.88 1788 DECELERATIŒT 5.80 0.172 28.43 622
DIXON ROAD 2 THROUGH L. 3.22 0.311 7.à5 1118
ISLINGTON AVE. 2 TILROUGH L. 2.17 0.461 3.79 1658
DUFFERIN ST. 2 THROUGH L. 1.40 0.712 1.23 2564
AVENUE ROAD 2 THROUGH L. 1.36 0.733 1.29 2640
32
and see how close they fit with the theoretical Poisson
distribution. In order to do this, we first calculated the
theoretical Poisson curve for each set of data, using the
formula P(t) = in which X" h.ad already been calculated
(see Table No. 2). This was easily d.one with the help of
Exponentiel Tables (9) . The next step was to classify oui'
observed headways in celle of one (1) second intervals and
to tabulate the observed cumulative cell frequencies. Since
the theoretical distribution-is a 100%-cumulative frequency
distribution (i.e. it gives the % of headways greater than
a given value), we also tabulated. the 100%-cumulative cell
frequencies of the observed headways in order to plot and
compare the theoretical curves with the one obtained from
our data. Tables A-1 to A-16 (in Appendix A) and Fig. B-1
to B-16 .(in Appendix B) show the observed resulte and their
corresponding curves together with the theoretical results
and their corresponding curves; also included are the
theoretical results and curves obtained from the Erlang•
distribution, used at a later stage of this thesis.
When we observe the Tables and Figures mentioned
above, we notice great discrepancies between the experimental
and theoretical results. bre certainly cannot conclude by a
more observation of the curves a very close fit between the
observed headways and the theoretical probability curves.
This wasto be expected because or the nature of the Poisson
33
distribution (3). Being derived as a limiting fOrm of the
binomial distribution it applies only when the number of
possible events is large (theoretically, infinite) and the
probability of occurrence of any individual event in the
time interval considered is small. An example of the kind
of data which we would expect to find dis tributed in the
Poisson form would be the number of accidents happening at
a very busy intersection; or the frequency of headways of
a given length on a road where the traffic volume is
extremely small. This is obviously not the case at our
study locations. The traffic volumes observed at the time
of filming are so heavy that the probability of occurrence
of a headway of any small time length is very large and the
number of possible large headways is very small. The
reason for studying the headways on the deceleration lanes
was precisely that when we began our study, we thought that
these lanes would carry the small volumes for which a
Poisson distribution might apply. Unfortunately, after
projection of our data to hourly traffic volumes, we
discovered that only one out of the four (4) deceleration
lanes studied had a reletively small volume. This happened
in the deceleration lane at Dufferin St., where the projected
hourly volume was 328 vehicles per hour. Of all the Figures,
Fig. B-9 is probably the one where we can observe the
closest fit between the experimental curve and the theoretical
34
Poisson curve. Although the two curves do not fit perfectly,
they are very close to each other for headways greater than
four (4) seconds. A statistical test performed at a later
stage of this thesis to check the goodness of fit of the
experimental and theoretical curves will show that even if
the two curves above mentioned donot fit statistically,
they fit much better than any other emilar set of two
curves at each study location. Although the statement of
definite conclusions would have to be supplemented by
other studies, we feel that this is an indication that the
Poisson distribution may be the best model to describe the
headway,distribution at small volume of traffic. This also
might be an indication of the volume which should be
defined as a "small volume" in Œrder tat the Poisson
function gives a fit.
From the observation of the Figures, we notice
that ail curves follow approximately the saee general
pattern. But there are so many variations among them that
we can hardly find a relation between the traffic rate of
flow and the goodness of fit of the observed headway
distributions with the theoretical Poisson distribution,
If any trend is to be observed, it might be that in most
cases (if not in ail) the dis crepancy between the
theoretical and experimental curves tends to decrease as
the headway time length "t" increases. This suggests that
35
the observed data might be represented better by two
distributions, one for small spacings and one for lerge
spacings. This idea of a "double distribution" was first
suggested by Greenshields (2) who once obtained a good fit
with a distribution for headways less than 4 seconds and o
another for headways of more than 4 secon3s. It would
therefore be interesting to check whether our data follow
this kind of pattern.
As already maltioned, the Poisson function
applied to the distribution of headways is of the general
form y = ex.(see eg. 2) which may be written:
logey = X.
Thus the equation plotted on semilog-paper becomes a straight
lins with a negative slope since x = -m. When me plot our
data on senilog-paper, we get the curves shown on the Figures
C-1 to C-16 in Appendix C. It anpears that the greatest
discrepancies occur for large headways but this is not the
case and simply due to the semi-log scale. In only 3 cases
out of 16 the data were more closely fItted by to straight
unes. And of these three, it will be seen later that one
fits the Poisson distribution at the 2.5% level and therefore
should nOt give a better fit with two straight unes. The
fact that the combined through lanes of Dixon Road (sec
Figure C-13) appear to be best represented by two unes when
36
in fact it fits the Poisson formula 1s here again due to the
semi-log scale. Indeed, we had, to break the une for only a
few points iihich are found in the larger headway range where
we find the minimum deviations between the experimental and
theoretical results but at the sanie time the maximum
discrepancies due to the semi-log scale. In the Islington
driving lane (Fig. C-4) and deceleration lane (Fig. C-6),
the only cases loft where we have the two straight linos
pattern, the change of direction on the Unes occurs at
approximately 13 and 9 seconda respectively. Althaugh the
intersection of the two straight unes is very sensitive
with respect to position of the two Unes and these unes
are only-band fitted within a specified. range we do not
believe that this is enough to explain the discrepancy in
the "location of the breaks" of the curves which in
Greenshields' study occurred. at 4 seconds. From ail this,
it appears that the theory developed by Greenshields con
hardly be generalized but is rather determined. and influenced
in each case by different location factors. Other studios
previously done on the sanie subject by J. L. Vardon (11)
and J. W. Wise (13) also showed great discrepancles with
Greenshielda' curves and therefare prove that we cannot
generalize this concept of a multiple distribution, each
random in its limited case, as one which would apply in ail
cases.
37
Greenshields (2) has also shown that for each
plotted point there is a car responding range of expected
error or natural uncertainty caused by the fact that nunless
the sample is very large there is always a difference
between the sample values and those of the universen. This
natural uncertainty, based on the standard deviation of the
sample, is obtained from the formula:
(5)
where n = the total number of happenings recorded
fo = the acCumulated frequency,
Since in our atudy n was always equal to 200, the factor
n is sovery close to unity that it can be negIected and n-1 the equation becomes:
Z =Vfo (1 - fo)
These figures have been calculated for each point and plotted
in Figures C-1 to C-16. With a few exceptions for points in
the (0-2) second interval, the unes drawn through the
experimental points stay within the natural uncertainty
range, from which we can conclude that the data can be
represented by a straight une. Even in the combined
through lanes of Dixon Road and the driving and deceleration
lanes of Islington Avenue where the data were fitted by
two straight lines, a single line would stay very closely
38
within the expected range of error.
Although the best fitting curve appeared to be in
most cases a single straight linejit is easily observable
from the Figures C-1 to C-16 that (with the exception of
Fig. C-9) the distribution is not a Poisson one. Everywhere,
esnecially in the small headway range, we observe great
variations between the two distributions and the slope of
the experimental and theoretical curves are different. The
fact hawever that the experimental data can be closely
fitted on a semi-log paper by a straight une means that
the model best representing them still has some exponential
form, more elaborate than the Poisson model and with a
different slope.
THE ERLANG DISTRIBUTION
From Tables A-1 to A-16 and Figures B-1 to B-16,
we observe many discrepancies between the experimental
distribution and the Poisson distribution. But a general
pattern common to ail cases is that in the smaller headway
range the experimental curve lies somewhere well above the
Poisson curve. Thus the model that we need to renresent
our data is one which would give greater probability values
in this range of small headways. We felt that the best
distribution serving Ulis nurnose is the A. K. Erlang
distribution. Figure 12 shows the Erlang distribution
39
ERLANG ARRIVAL or SERVICE-TIME DISTRIBUTION. Probability that the next arrivai will occur
after time interval t.
FIGURE 12
for several values of the parameter K; where K=1, the
distribution is the simple exponentiel or Poisson case. The
Erleng distribution bas been extensively used in telephone
traffic for different purposes such as to calculate the lino
holding or waiting time and we felt that similarities
between telephone and highway traffic in crowded situntions
are such that it might well be applicable to highway traffic.
NATURE OF TUE ERLANG DISTRIBUTION
The Erlang distribution can be thought upon as if
every oncoming vehicle had to pass throtj a series of
exponential,channels, called phases, be held in the
exponentiel channel for a variable time and thaireleaSed
from the channel before the following vehicle can be
accommodated. Each phase is of the exponentiel or Poisson
type but the resulting distribution is not exponentiel.
There is a possibility of forming any kind of distribution
pattern by simply adding more and more phases. These
distributions, called Erlang distributions, provide a family
of service-time distributions which range from the completely
random exponential type to the completely regular service-
time situation. This kind of service-time distribution can
be easily interpreted as appl:ying to a freeway toll booth
operation. In such a case, it is perfectly imaginable that
a vehicle has to go through any number of phases that we went
Li
before being accommodated by the toll booth facility and the
following vehicle being allowed in the sanie booth. This is
not so easily interpretable when applied to the headway
distribution. It is indeed hardly imaginable that the
traffic flow actually goes through such phases. Or if it
does so, it is still more difficult to physically separate
its operation into distinct phases. The only physical
interpretation that we cari think of would be to assume a
traffic stream composed of two types of drivers, each type
representing a different phase. One phase would include
ail those drivers who are always in a hurry and therefore
always keep the distance between their vehicle and the
leading vehicle (the headway) to a minimum. As soon as
they can find in the parallel traffic lane a minimum
acceptable gap, they shift lanes and overtake the leading
vehicle. The other phase would be composed of ail the
drivers who, not being in a hurry, don't mind to have any
gap langth between their vehicle and the leading vehicle.
These drivers are assumed to operate their vehicles as if
they were not influenced at ail by the operation of the
other vehic les in the traffic stream. Although this inter-
pretation may not be totally in conformity with the nature
of the Erlang service-timn distribution types, it is the
best that we could think of. On the other hand, it was not
so important to us to visualize a physical interpretation
42
to a mathematical model as to find a mathematical model which
would best fit our experimental data. The Erlang distribution
being "less random" than the Poisson distribution since it
predicts fewer very short or very long intervals between
arrivais, it appeared to be a mathematical model that might
give a better fit to our observed headway distribution than
Poisson.
The Erlang distribution is given by the formula:
K=1 A0(t) = e
_KAt (KAt)n (6)
n=0
where:
Ad(t) = the'probability that no arrival'occurs4n time t after the previous one.,
À = the mean rate of arrivai.
,K = the number of phases in the system.
n = the number of states in tha system.
e = the base ofNaperian Logarithms = 2.71828.
Applied to traffic, the equation .(6). becomes:
-K)tt K=1 e P(t) = (KAt)n/n1 (7)
n=o
where,
P(t) = the probability of occurrence of a headway greater than t seconds.
A = 15, 7 being the average of observed headways.
L13
Substituting K=1 in (7) gives:
P(t) = which is the familiar exponential or
Poisson distribution (see eq. 4).
After a careful examination of the family of
Erlang curves as shown in Figure 12, we felt that the
Erlang distribution with two phases (or K=2) had the best
chances to fit our experimental data. In order to check
this, we tried to fit the experimental data of the Avenue
Road driving lane with a three phase Erlang distribution
(K=3); a test of goodness of fit proved that an Erlang
curve with K=2 gives a botter or closer fit. Then we
decided to analyse the fit obtained from the latter at ail
study locations. Substituting K=2 in eq.(7) gives:
P(t) = (1 2 At) e-2At (8)
As we had previously done for the Poisson distribution,
by substituting different values to "t" in .eq. (8), we
obtained for ail sets of data the theoretical Erlang
distribution with K=2. These results and curves have been
summarized in Tables A-1 to A-16 and Figures B-1 to B-16.
In ail cases, as we expected, this distribution
gives a much closer fit than the Poisson distribution in
the smaller headway range. Then follows a transition
range of headways in which we observe great discrepancies
between the experimental distribution and either one of
Poisson or Erlang. In this range, we don't observe either
any regularity: in some cases, Poisson gives a better fit,
in other cases it is Erlang. In the larger headway range,
the discrepancies between the experimental data and the
theoretical Poisson or Erlang curves decrease appreciably
but here again we donet observe any regularity. As for the
intermediate range, the experimental distribution sometimes
lies between the Poisson and Erlang distributions, sometîmes
getting closer to either one-of them but remaining inside;
sometimes it goes outside either one of them. In general
however, the observed distribution tends to be closer to
the Erlang distribution.
From observation of the results and curves, it
does mot appear that our observed data can be represented
by either one of the theoretical distributions. Further-
more, if one of them is to give a fit, we can hardly
determine which one it would be since, although the Erlang
distribution generally lies closer to the observed data,
the determination of a goodness of fit based on a simple
examination of curves is usually very misleading.
TEST OF GOODNESS OF FIT
Several statistical tests of significance exist
which allow us to determine with more certainty if the
experimental and theoretical data coincide. The chi-square
(X2) test is the most appropriate.to the present application.
By definition Y X2 = 2: ( f'-f .:02. (9).
i=1 ft
where,
fo = the observed frequency for any class interval.
ft = the computed or theoretical frequency for the same class interval.
K = the number of .class intervals.
If n = the total number of observations, then ft = n pi,
pi being the probabilities associated with the class
intervals. When we compare the statistics obtained from
eq. (9) with the X2 distribution with degrees of freedom
V=K-Y, •whère Vis the number of linear restrictions imposed
on the difference (fo-ft), we can test if the experimental
data can be represented by any given theoretical distribution.
The X2 tabulated values are the maximum values which the
sample statistic can assume and yet stiil be considered as
representing that the experimental curve does flot differ
significantly from the theoretical curve. In other words,
if the semple statistic obtained from eq. (9) is smaller
than the tabulated value at a given significance level are
there is no evidence to indicate that the experimental
distribution differs from the theoretical distribution,
the other hand, if the semple statistic exceeds the
tabulated value at the sanie significance level q,, we have
(1-cteo of chances of being right when we affirm that the
experimental distribution differs from the theoretical data.
We could also say that the probability is less than ar % that '
the experimental and theoretical curves are the sanie.
Common significance levels are 0.01, 0.025 and 0.05.
We can now use this test to check which one of
either Poisson or Erlang distribution represents more closely
our experimental data. For this purpose, we compared the
experimental observed frequencies (f o ) with the theoretical
expected class frequencies (ft) derived from both distributions.
As previously stated, the expected class frequencies are
obtained by multiplying the number of observed frequencies
(n) by the probability (pi) associated with each class
interval. Although these probabilities could have be.en
obtained in tables in the case of the Poisson distribution,
the fact that there were not such tables for the Erlang
distribution lead us to decide not to use the Poisson tables
but rather to use the saine procedure for both distributions
and calculate them directly from our results summarized in
Tables A-1 to A-16. These tables give the probability of
occurrence of a headway greater than a given time t, both
for Poisson and Erlang distributions. The class interval
probabilities (pi) which were needed for the chi-square
tests could simply be obtained by subtracting successively
these tabulated values. Chi-square tests of significance
have been performed for ah l study locations, each turne
47
comparing the observed data with both Poisson and Erlang
distributions. These are shown in Tables D-1 to D-32 of
Appendix D. The fact that the class interval probabilities
(pi) indicated in the above Tables have four (4) figures
while the probability values of Tables A-1 to A-16 from
which they have been derived have only three (3) figures
is simply due to rounding of the latter figures. The chi-
square test results have been summarized in Table 3, from
which we can make a few observations. Firstly, only three
(3) out of sixteen (16) sets of experimental data gave a
statistical fit. At Dufferin deceleration lane and Dixon
,driving lane, we get a fit with Erlang distribution at the
1% level and a fit with Poisson at the 2.5% level in the
combined thrbugh lanes of Dixon Road. The t/;affic volumes
at these locations were respectively 328, 460 and 1118 VPH.
This is totally opposite to our expectations, since we
always felt that the Poisson distribution had best chances
to give a fit for small traffic volumes and Erlang for heavy
volumes. Secondly, out of the thirteen (13) study locations
remaining, most of them (11) gave a closer fit with the
Erlang distribution, with only two (2) being fitted more
closely by the Poisson distribution. Thirdly, the combined
through lanes, with the exception of Dixon Road which gave
a fit with Poisson, ail fit very nearly with Erlang.
From ail this we can hardly suspect the existence
MI MI MI MM MI MI Mal MI 1311 11•1 IBM 1111111 Mil MM MI MI MI IM
TABTP1 NO. 3
SUMMARY OF CRI-SQUARE TEST RESULTS
LOCATION TYPE OF LANE
VOLUM STATISTICS (POISSON)
CHI-SQUARE VALUE ( rg)
DIFFER- ENCE
STATISTICS (ERLANG)
CHI-SQUARE VALUE (32.-1,)
DIFFER- EICE
CL0S2, FIT TC
DUFFERIN DECEL. 328 30.59 27.69 2.90 23.30 27.69 4.39
t d t t
: bd b d bd pl pl bl
ITJ t i1 PI w
1 71 1
71 t1
r
1-1 ri
CQ
! 7:›1
C0 U5
Ç)
Q CD Li) Q (.1 L
I)
ç) QQ o p ci)
Ç4 Q
DIXON DRIVING 460 )01 .77 27.69 17.08 25.69 29.14 3.45 ISLINGTON DRIVING 562 65.39 24.73 40.66 26.74 214.73 2.01 AVENUE RD. DECEL, 622 76.50 26.22 50.23 80.51 26.22 54.29 DIXON PASSING 658 47.13 26.22 20.91 87.03 26.22 60.81 ISLINGTON DECEL. 674 71.61 24.73 46.88 57.141 24.73 32.68 DIXON DECRTi. 846 76.60 23.21 53.39 60.814: 21.67 39.17 AVENUE RD. DRIVING 852 69.21 21.67 47.54 29.30 21.67 8.13 DUFFERIN DRIVIR7T 950 127.39 20.09 107.30 60.16 20.09 40.07 ISLINGTON PASSING 1096 71.81 20.09 51.72 46.06 18.48 27.58
DUFFERIN PASSING 1614 115.69 16.81 98.88 36.95 15.09 21.86
AVENUE RD. PASSIM 1788 163.70 15.09 148.61 71.32 13.28 58.04-r DIXON 2 LARES 1118 14.95 16.01 1.06 53.52 18.48 35.014
ISLINGTON 2 LARES 1658 31.12 16.81 14.31 20.06 18.48 1.58
DUFFERIN 2 LANES 112640 37.25 13.28 23.97 11.04 9.21 1.83
AVENUE RD. 2 LARES m2564 59.24 13.23 45.96 11.17 9.21 1.96
NOTE: x - Fits at the 2.5% level. * - Fits at the 1% level.
14-9
of any relationship betWeen the traffic volumes and the
application of either Poisson or Erlang. It appears however
that the Erlang distribution generally represents the headway
distribution better than the Poisson distribution, although
neither one gives an accurate representation of the actwaL
observations.
SIMULATION BY PARALLEL ARRANGEMENT'
The next step was.to try another probability
distribution which would fit the experimental data closer
than the previous distributions. The Erlang distribution
was defined for integer values of the parameter K and greater
than unity. Me feltthat it would be interesting to ti'y a
distribution where the value of K is smaller than unity.
Such a value would correspond to a situation "beyond"
Poisson, which might •be called hyper-random. We felt fully
justified in trying this new approach since the authors of
a recently published research project (4) on the saine
subject declared: "there seems to be some evidence that a
multi-lane freeway with very high traffic volumes might
be hyper-random".
A model which gives such hyper-exponential
curves is one, as in the case of the Erlang distribution,
that assumes exponential channels. But unlike Erlang,
where these channels were arranged in series, this one
would assume 'a parallel arrangement of channels (8). It
is represented by the density function':
.de-2ent (1-01 e -2(1-01nt So(t) (10)
When applied to traffic, eq. (10) becomes:
-24t P(t) = '75F (1.4 () e-2(1—e) '
where P(t) and have been defined in other sections of this
thesis and o4nti. Our procedure was first to determine the parameter 4- ,
which was given by the equation of the second degree:
r + 2 sr (1-41] =
j (12)
wheré j eqUals the expression in the brackets. (jeol) and
s2 = the-sample variance. Then, having determined 0- , we
could calculate P(t) from eq. (11), for, different values of
t. When 1ooking at the curve patterns of eq.(10) which are
shown in "ligure 13, we had good reasons to believe that
some Of our set of data, especially when the observed dis-
tribution lies for a great part below the Poisson curve,
would assume a similar type àf distribution with different.
rand j values.
When we solved eq.(12) by substituting theits ànd
s2 is values of ah l sets of data, we obtained imaginary roots
for d' in ail cases but one, ald it was in the passing lane
set)
or
Aste
-1
FAMILY OF ARRIVAL DISTRIBUTIONS CORRESPONDING TO A PARALLEL ARRANGEMENT OF EXPONENTIAL CHANNELS.
FIGURE 13
of Dixon Road. The resulting equation was
4.07e2 _ /-1--07tr + 1 = 0, whose solution gives (r= 0.462..
Since s2 = j 2, 32.18 = (5.48)2 j, from which j = 1.07.
Thus the theoretical distribution.at the passing lane. of
Dixon Road would be an hyper-exponential one but located very
close to the exponential or Poisson curve. This agrees
with the results obtained when performing the chi-square
tests. In this case we had found out a closer relation
with Poisson than with Erlane but not a statistical fit.
The only other case where Poisson gave a closer fit than
Erlang was in the deceleration lane of Avenue Road.
Logically we would have expected here a fit with an hyper-
exponential- curvb, although less than at Dixon Road since
the discrepancies in the small headway range are larger.
The fact that we did not obtain aly real equation for d-
in this case would indicate that the experimental distri-
bution is better represented by a theoretical distribution
located somewhere between Poisson and. Erlang. We feel that
the same conclusion could. be applied to ail cases where
we did not obtain a fit with either Poisson or Erlang but
where Erlang gave a closer fit. Although we did not compare
our data with an Erlang distribution with K=3, we believe
that the best fitting distribution is of the Erlang type
with a K value between 1 and. 2.
53
RELATION OF PARAMETER K TO VOLUME
Since the Erlang type of distribution appeared to
us as a model susceptible to represent our experimental data,
the next logical step was to find out if there is a linear
correlation between the K values and the traffic volumes.
If we could find such a correlation, we possibly could try
to fit our data with a Gamma function which is an Erlang
type distribution but has the advantage to work for any
value of K. The coefficientS of variation of K was 1/(77
and was equal to the sample standard deviation divided by
the sample mean. Thua
1 = s , from which we get:
(13)
The K values were first calculated for ail individual lanes
and plotted against the traffic volumes. Immediately it
was obvious that the large amount of scatter ruled out a
perfect relationship. The data was then analysed statistically
to see if there was any linear relationship at ail. The
square of the correlation coefficient for pairs of measure-
ments was calculated since this value would be a measure of
the linear dependence of one set of values on •the other.
The traffic volumes were designated as xi while corresponding
values of K were designated as Yi. 12 pairs of measurements
54
were suitable for malysis.
Then the square of the correlation coefficient
(rx72) is given by:
2 En - I xi yi] 2
rxy = En I (xi2)- (!xi)2][n (yi2) Œ
yi )23
In the present case,
n = 12; Exi = 10,450;Z yi = 20.23; Ixiyi = 19,323.78
i(xi)2 = 11,256,428; 5:(yi)2 = 39.28; Œx)2 = 109,202,500;
CEn)2 = 409.25.
Substituting these values in eq.(14) gave
r2 y = 0.261, therefore the K factor is only 26.1% linearly
dependent upon the volume of traffic.
The above test was then repeated using values for
the combined through lanes. In this case,
n = 4;1Exi = 7980;ZYi = 5.65; 2:xiyi = 11461.90;
E(x1)2 = 17,542,584; 1(Yi)2 = 8.04; (Exi)2 = 63,680,40o;
GEyi)2 = 31.92; r2xy = 0.371.
Then, in the case of the combined through lanes, the K
factor is only 37.1% linearly dependent upon the volume.
The only conclusion to be drawn from these figures would be
that the K factor assumes a slightly more linear dependence
upon the volume when we consider the traffic stream as a
whole rather than when we consider each individual lane.
Although the values of 26.1% and 37.1% are quite
low, it was felt that a "best" straight lime should be
(14)
determined in any case. This une is calculated by the
method of least squares and has the form:
=
where 7 and 7 are the means of the x's and the yts,
and,
y.x (rxi)
n I(xi)2 - (E x)2
In the case of individual lanes,
= 10,450 = 870.83; 7 = 20.23-= 1.69 12 • 12
and for the:combined through lanes,
7 = 790 = 1995; 7 = = 1.41 4
Substituting these values of 7 and 7Y- and the above values
for n,rxi,Zyi,IExiyi, Y(xi)2, (x1)2 in eq.(15), we
respectively obtained:
0.00079; and by.x = 0.00012.
Thus, the "best" straight unes for each individual lane
and the combined through lanes are respectiyely:
y - 1.69 = 0.00079 (x - 870.83) (une A)
y - 1.41 = 0.00012 (x - 1995) (une B)
These unes have been plotted in Figures 14 and 15.
55
MI NB MI MI 1•11 MB MI MB MB MB BU 111111
5.0_
4.0
3.0
A 2.0
1.0
PA
RA
ME
TE
R
0 C I iobo 5 JO
272 0 00
LANE TRAFFIC VOLUME (VPH)
FIGURE 14: INFLUENCE OF LANE VOLUME ON PARAMETER K
4. 0
3.0
P A
RA
ME
T E
R
2.0
1.0
0.0
am mu am am am am ma mi ma mu am ma am ma ma ma ma
13 g
g
tIM
1000
1 1 1 I 1 1 I 1 I 1 1 I 1 1 1 1 I '
1500 2000 2500 3000
TWO COMBINED THROUGH LANES TRAFFIC VOLUME (VPH)
FIGURE 15: INFLUENCE OF TOTAL VOLUME OF COMBINED THROUGH LANES ON PARAMETER K
58
It should be emphasized that these two straight
unes are not necessarily the best curves to fit the data
but are merely the best "fitting" straight unes. We
know from the values of the correlation coefficients that
there is a very small linear relationship between the
parameter K and the traffic volume. The true relationship
is certainly a more elaborate one and would be represented
by an equation of a higher degree. It was not felt however
to be worthwhile to find out this true mathematical relation-
ship since this would lead to a theory too elaborate for
practical application. For ail practical purposes, especially
if accuracy is not required, we believe that these unes
are reliable enough to show which value of K corresponding
to a given volume should be used when working with a
Gamma function.
RELATION OF PARAMETER K TO TYPE OF LANE
From what we have seen, we know that the relation-
ship between the K values and the volumes of traffic is
not a simple one. Letts now reclassify these K values, but
this time in relation to the type of lane and the study
location. Table 4 'shows such a classification.
59
TABLE L.
CLASSIFICATION OF K VALUES IN RELATION TO TYPES OF LANE AND STUDY LOCATIONS
TYPE OF STUDY LOCATTOU . TOTAL LANE Dufferin Dixon Rd. Avenue Rd. Islington
Decelera- tion 1.18 1.09 1.18 1.00 4.45
Driving 2.24 2.04 1.99 2.30 8.57
Passing 3.03 0..93 2.15 1.10 7.21
TOTAL 6.45 4.o6 5,32 , 4.40 20.23
From observation of the above table there appears
to exist a relationship between the parameter K and the type
of lane. We notice thatall values of K are close to unity
for the deceleration lanes, and close to 2 for the driving
lane; we observe no regularity in the case of the passing
lanes. However, it is not certain that the type ar lane
is the only influencing factor. It is also possible that
these values could have been influenced by the study
location itself. The best way to determine the interaction
of these factors was to carry out a well known statistical
procedure, the analysis of variance.
Since the method of performing an analysis of
variance can be found in every textbook of Statistics, it
was not felt necessary to explain it here. A summary of
this table is included, however, as well as the computations
60
leading to our results. Table 5 shows the table used to
analyse our data and the resultà are s'ummarized in Table 6.
TABLE 5
GENERAL ANALYSIS OF VARIANCaTABLE. TWO-WAY CLASSIFICATION WITH INTERACTION.
Source of Estimate
Sum of Squares S. of. S.
Degrees of F eedom(D.F.)‘
Mean Square M.S.
MEAN
BETWEEN ROWS
BETWEEN- COLUMNS
INTERACTION
TOTAL
T..2 1
ni - 1
nj - 1
(ni-l)(nj-1)
='ninj
/
S.of S./ni-1
S.of S./nj-1
S.of S./(ni-l)(nj-1)
N
571c2._1 - T..2
4- nj N
.T..2 _ T ..2 L-ni N
2:Xb1:1.2 - nj
4.- ni N
• Z X2 ij N ij
where Xij = the observations classified in ni rows and ni
columns; N = nini; T.j = 2:Xij; Ti. =IXii; T.. = ni ij
In our case (see Table 52), ni = 3; nj = '4; N = 12;
Z_X2ij = (1.18)2 + + '(1.10)2 = 39.27; ij
T..2 = (20.2 3)2 = 34.10; ZT.2 J = ()t5)2 -F. (8.57)2 +(7.21)2 N. 12 nj 4 4
= 3 .3I; T• = (6.)5)2 t (4,06)2 + (5.32)2 + (4.40) 2 ni 3 3 3 3 .
= 35.24.
ni
61
Thus the variation due to the type of lane = 36.31 - 34.10
= 2.21; the variation due to the study location = 35.24
314.10 = 1.14; the interaction = 39.27 - (34.10 + 2.21 + 1.14)
= 1.82.
Ide can now set up the following analysis of variance table:
TABLE 6
ANALYSIS OF VARIANCE TABLE. ALL THREE TYPES OF LANE INCLUDED.
SOURCE OF, ESTIMATE
SUM.OF SQUARE S. of S.
D.F. MEAN SQUARE
Mean
Between Types of iJele
Between StUdy Locations
Interaction
Total
34. 0
2.21
1.14
1.82
, 39.27
2
3
6.
12
2.21
1.14
1.82
4
4
4
2
3
6
=
=
=
1.05
0.38
0.303
The above resuIts allow us to carry out a few tests of
significance:
1. Le-Us check the hypothesis that the study location
does not affect 'the factor K at the 5% level.
From our table, 0.38 = 1.26 - 0.303
From the F-distribution F(36, 0.05) = 4.76
Since 1.2644.76, this means that the test is not
1
1
62'
significant and therefore the stated hypothesis is true.
Thus the study location does not affect the K factor at
the 5% level. This conclusion is very satisfactorily
accepted since if the opposite had been true, it would
have indicated that our results are simply due to chance
and not conclusive in any way.
2. Let's now check the hypothesis that the type of
lane does not affect the factor K at the 5% level.
I . From our table, 1.105 =-3.64
0.303
From the F-distribution, F(2e6,0.05) = 5.14
Since 3.64 45.14, this means that the test is not
significant and therefore the type of lane does not affect
the K factor. In other words, the obtained results give no
evidence of a relationship between the type of lane and the
value of K. It need not be emphasized that this is a very
disappointing conclusion since such a relationship had
appeared strongly possible from observation of the results.
We believe that the fact that the -lest did not turn signi-
ficant can be explained by either one of the following
causes: the number of observations was insufficient, thus
providing no solid ground for a statistical analysis; or,
what is more probable, the discrepancies between the K
values of the passing lanes are so great that they may
cause the test not to be significant. Although the first
cause was quite possible and certainly cannot be eliminated,
1
63
we felt that it was beyond the scope of this thesis to
investigate it. The second cause could be simply checked
by analysing the variance of the data for te driving and
deceleration lanes, thus excluding the passing lanes where
the greatest variations in the value of K were found. An
analysis of variance was then carried out for the data of
Table 7:
TABLE 7
CLASSIFICATION OF K VALUES IN RELATION TO STUDY LOCATIONS AND TUO TYPES OF LANE ONLY.
TYPE OF LANE
S _ TOTAL Dufferin Dixon Rd, Avenue Rd.. Islinaton
Decelerà- tion ' 1.18 1.09 1.18 1.00 • 4.45
Driving 2.24 2.04 1.99 2.30 8.57
Total 3.42 3.13 3.17 3.30 13.02
In this case, ni = 2; ni . 4; N . 8;
E2X1i = (1.18)2 + .... + (2.30)2 = 23.40; T..2 = (13.02)2 ij N
= 21.19; 2:T.2j = (441.5)2 + (8.57)2 = 23.31; nj 4 4
I y Ti.2 = (3.42)2 + (3.13)2 + (3.17)2 4- (3.30)2 = 21.22; '"" ni 2 2 2 2
The variation due to type of lane = 23.31 - 21.19 = 2.12;
the variation due to study location = 21.22 - 21.19 = 0.03;
From this, the following analysis of variance table (Table
8) was set up:
TABLE 8
ANALYSIS OF VARIANCE TABLE. PASSING LANE EXCLUDED.
SOURCE OF ES IMATE
SUM OF SQUARE •
D.F. MEAN SQUARE u
Mean 21.19 1
Between Types of Lane 2.12 1 2.12+1 = 2.12
BetWeen Study Locations 0.03 3 0.0343 = 0.01
Interaction 0.06 3 0.06+i = 0.02
Total 23.40
Ne can now verify the same hypotheses as previously:
Hypothesis: the stndy location does not affect the
parameter K at the 5% level.
From our table, 0.01 = O. 0.02
From the F-distribution, F(3,3,0.05) = 9.28
Since 0.54.9.28, the test is not significant. There-
fore there s definitely no evidence to indicate that the
study location affects the value of K.
Hypothesis: the type of lane does not affect the
parameter K at the 5% level.
From our table, 2.12 = 106 0.02
6)4
65
From the F-distribution, F(1,3,0.05) = 19.13
Since 106».10.13, the type of lane is revealed as a
highly significant effect. This is a very interesting
conclusion that we had expected when we first observed
Table 4 and suspected a trend. between the type Of lane and
the factor K.
According to this, the headway distribution of an
urban freeway would be theoretically represented by different
distributions when we cons ider each Iane separately. The
deceleration lane headways would. be best represented by an
Erlang distribution with K=1, which is the Exponential or
Poisson distribution; in the driving lane, a good theoretical
model would be an Erlang distribution with K=2; finally, the
passing lane assumes so many Variations that a specific
Erlang curve does not apply in ail cases but any one or
the family couId apply in. individual cases. These
conclusions 'coincide well enough with what had already
been obtained when performing •the chi-square tests to
Compare the goodness of fit of Erlang (K=2) and Poisson
distributions to our experimental data. These tests had
first indicated a better fit with Erlang (K=2) than with
Poisson in ail driving lanes. In one occasion (Dixon Road),
there was a statistical fit and one was very close
(Islingtor). However, there is partial disagreement when
we corne to the deceleration lanes. Indeed, only one out
66
of four deceleration lanes (it was at Avenue Rd.) had given
a closer fit with Poisson when checking with the chi-square
test. Two had showed a closer fit and one had given a
statistical fit with Erlang (K=2), although in this last
case a fit with Poisson was very close, the difference
between the chi-square statistics and the tabulated value
being as small as 2.90. These discrepancies are not easily
explained but we think that the conclusions drawn from the
analysis of variance table are much more reliable than those
suggested by the chi-square tests. While the analysis of
variance gives a positive evidence when it is significant,
a significant chi-square test only provided us with a
negative and indirect evidence if we consider the criteria
that we used to decide which one of Erlang (K=2) or Poisson
distribution best represented our experimental data. This
criteria was based upon the minimum difference between the
statistic obtained when fitting our data to either one of
Poisson or Erlang and some tabulated values. This will be
best illustrated by the following example: In the Islington
deceleration lane, the inference that Erlang (K=2) gives a
better fit than Poisson was based upon the fact that the
difference between the statistic derived from Erlang (57.41)
and the chi-square tabulated value (2)1.73) is smaller than
the corresponding values (71.61 and 24.73 respectively)
obtained when fitting our data to Poisson. We believe that
67
such an inference still provides evidence but rather negative
as compared with the evidence provided by an analysis of
variance table. Since the closer fit to Erlang has also
been decided according to the same criteria in the case of
the Dixon Road deceleration lane, there is really only one
case where the condusionsdrawn from the analysis of variance
table and the chi-square method basically disagree. This
happens in the Dufferin deceleration lane for which a chi-
square test provided signific-ant forPoisson and not
significant for Erlang (K=2). Here the previous attemptS
to explain the apparent contradiction between the conclusions
inferred by both statistical methode do not hold since,
being not significant, the chi-square test provides us with
a positive evidence that we cannot attenuate. Although the
difference between the statistic obtained when fitting our
data'to Poisson and the tabulated value is very small (2.90),
the test with Poisson is not significant and therefore, even
if this gives ground to infer that Poisson nearly gives a
fit, the conclusion suggested by the non-significant test
is much more positive and muet be the one accepted.
Thus, with the exception of this last case, the
apparent dis crepancies between the trends suggested by the
analysis of variance and chi-square methods are not serious
and can be partly explained. Therefore, we have good
reasons to affirm that there is a relationship between the
68
value of the parameter K and the individual lanes of an
urban freeway, as demonstrated by the previous analysis of
variance. It has also been suggested to apply Poisson in
the case of a deceleration lane and Erlang (K=2) in the case
of a driving lane. It should be emphasized however that
they are not necessarily the distributions which will give
the best fit in ail individual cases. The best fitting
distribution would be one with a value of K calculated in
each case from the experimenthl data. For ail practical
purposes however, we believe that the distributions with
K=1 and K=2 should give the best overall fit when applied
to deceleration and driving lanes respectively.
IV. CONCLUSIONS
This study has attempted to investigate the
distribution of headways on Highway 401, an urban freeway.
The statistical approach was an attempt tomake the analysis
general enough so that the results could have application
to other locations. It is hoped that the observed headway
distributions on Highway 401-and their statistical analysis
can be extended and applied ta the longitudinal flow pattern
of any urban freeway. The inferences drawn from our study
should certainly be supplemented by more data, but never-
theless they do establish a foundation for further
investigation.
The analysis performed in this thesis suggested
the following conclusions:
The photographie method, although it is accurate
and perhaps the most useful tool in a comprehensive study
of 'the traffic flow, is very tedious whenextraeting the data
from the films. Another method might be used more
advantageously when studying only the longitudinal traffic
flow characteristics.
The headway distribution of an urban freeway
shows many discrepancies with the Poisson and Erlang (K=2)
probability distributions. However, the Erlang distribution
-69-
generally gives a closer statistical fit to,observed data
than Poisson and should therefore be preferred to the latter
to describe the pattern of arrivais on a 4-1ane urban
freeway. For ail practical purposes, calculations based on
an Erlang (K=2) distribution are mostly in the 'safe side
and certainly more accurate than when based on a Poisson
distribution. Our present traffic theory actually based on
Poisson would undoubtedly gain in accuracy if it was modified
and based on Erlang (K=2).
The Erlang distribution fits the observed
distribution of headways most closely when such a distri-
bution is considered for the combined through lanes rather
than for each lane taken individually.
The probability of a linear relationship between
the traffic volume and the parameter K of the Erlang
distribution is very small. This probability appears to
increase when the traffic lanes are considered in combination
instead of individually. The assumption of a linear relation-
ship however is very useful and could be advantageously
used when great accuracy is not required. A Gamma function
should then be used, the value of the parameter K being
taken from either one of the Fig. là_ or 15.
An interesting result is that there appears to
exist a correlation between the type .of lane and the
parameter K. Accordingly, an Erlang distribution with R=2
727 would generally apply to the headway distribution in the
driving lane and an Erlang distribution with K=1 (or
Poisson) would apply to the deceleration lane. This
was ex'pected in the lattei case since the vehicles diverging
in the deceleration lane are likely drawn at random from
the main through traffic stream, thus suggesting the use of
the Poisson distribution. The fact that Poisson did not
give a fit in this case could be explained by the fact
that we don't have a "complete randomness" since the
diverging vehicles were influenced by the through traffic
stream before performing their diverging manoeuver.
The "two straidat unes theory" as suggested
by Greenshields (2) did not apply to Highway 401. It would
therefore appear that his theory cannot be generalized to
ail conditions, or should certainly be modified.
A model of hyper-exponential distribution has
been tried but proved unsuccessfu1 to fit the observed
data. It is felt however that further investigation with
a different model could turn out more successful and should
therefore be carried out.
A statistical model, by nature, isa mathematical
formula which intends to describe some observed data with
the greatest accuracy possible. It is therefore impossible
that it fit3perfectly the data, otherwise it becomes a
physical law based on certainty and can no longer be called
TABLE A-9
OBSERVED AND EXPECTED DISTRIBUTIONS - OF HEA..DWAYS
DECELER.A,TION LANE - DUFFERIN
CLASS INTERVAL
(SEC)
FREQUENCY (fo)
CUMULATIVE FREQUENCY
CUMULATIVE FREQUENCY
% OF HEADWAYS GREATER THAN THE CLASS INTER-VAL UPPER LIMIT
SHOWN 100% Theo-
retical Poisson
Theo-retical Erlang- (K=2)
0.0-0.9 1 1 99.4 91.3 98.5
1.0-1.9 13 14 91.9 83.4 94.8
2.0-2.9 15 29 83.2 76.1 89.6
3.0-3.9 21 50 71.1 69.5 83.5
4.0-4,9 8 58 66.5 63.4 76.9
5.0-5.9 13 71 59.0 57.9 76.2
6.6-6.9 lo 81 53.2 52.9 63.6
7.0-7.9 6 87 49.7 48.3 57.3
8.0-8.9 12 99 42.8 44.1 51.3
9.0-9.9 6 105 39.3 40.3 45.7
10.0-10.9 7 112 35.3 36.8 40.6
11.0-11.9 8 120 30.6 33.6 35.9
12.0-12.9 4 124 28.3 30.6 31.6
13.0-13.9 5 129 25.4 28.0 27.8
14.0-14.9 7 136 21.4 25.5 24.3
;---15. o 37 173 o.o - -
N.173
•
83
TABLE A-10
OBSERVED AND EXPECTED DISTRIBUTIONS OF HEADUAYS.
DRIVING LAUE - AVENUE ROAD
CLASS INTERVAL
(SEC)
•
•
OBSEMVED FREQUENCY
(fo)
CUMULATIVE FREQUENCY
CUMULATIVE FREQUDECY
% OF H_MDWAYS GREATER THAN THE CLASS INTER-VAL UPPER LIMIT
SHOWN 100% Theo-
retical Poisson
Theo-retical Erlang (K=2) -
0.0-0.9 3 3 98.5 79.0 91.2
1.0-1.9 49 52 74.0 62.4 75.6
2.0-2.9 43 95 52.5 49.3 58.6
3.0-3.9 28 123 38.5 38.9 43.7
4.0-4.9 21 144 28.0 30.7 31.7
5.0-5.9 11 155 • 22.5 24.3 22.6
6.0-6.9 • 15 170 15.0 19.2 15.8
7.0-7.9 12 182 9.0 15.1 10.9
8.0-8.9 5 187 6.5 12.0 7.5
9.0-9.9 4 191 4.5 9.4 5.1
10.0-10.9 1 192 h..0 7.5 3.5
11.0-11.9 2 194 3.0 5.9 2.3
12.0-12.9 o 194 3.0 4.6 1.6
13.0-13.9 2 196 2.0 3.7 1.0
14.0-14.9 2 198 1.0 2.9 •
0.7
15.0-15.9 1 199 0.5 2.3 0.4
16.0-16.9 1 200 0.0 1.8 0.3
N=200
II II II II
TABLE A-11
OBSERVED AND EXPECTED DISTRIBUTIONS OF HEADWAYS.
PASSING LANE - AVENUE ROAD
CLASS INTERVAL
(SEC)
OBSERVED FREQUINCY
(fo)
CUMULATIVE FREQUENCY
CUMULATIVE FREQUENCY
% OF HEADWAYS GREA TER THAN THE CLASS INTER-VAL UPPER LIMTT
SHOUN no% Theo-
retical Poisson
Theo- retical Erlang (K=2)
0.0-0.9 14 III 93.0 60.8 73.7
1.0-1.9 116 130 35.0 36.9 40.8
2.0-2.9 43 173 13.5 22.5 20.1
3.0-3.9 14 187 6.5 13.6 9.3
4.0-4.9 6 193 3.5 8.3 4.1
5.0-5.9 2 195 2.5 5.0 1.7
6.o-6.9 2 197 1.5 3.1 0 . 7
7.0-7.9 2 199 0.5 1.9 0.3
8.0-8.9 o 199 0.5 1.1 0.1
9.0-9.9 0 199 0.5 0.7 0.05
10.0-10.9 0 199 0 . 5 0.4 0.02
11.0-11.9 o 199 0.5 0.3 0.009
12.0-12.9 1 200 0.0 0.2 0.003
N=200
85
TABLE A-12
OBSERVED AND EXPECTED DISTRIBUTIONS OF HEADWAYS.
DEC-4TRRATI0N LAME -• AVENUE, ROAD
CLASS INTERVAL
(SEC)
•
OBSERVED FREQULNCY
(fo)
CUMULATIVE FREQUSTCY
CUMULATIVE FREQUdICY
% OF HEADWAYS GREATER THAN THE CLASS INTER-VAL UPPER LIMIT
SHCUN 100% Theo-
retioal Poisson
Theo-retical Erlang CK=2)
0.0-0.9 1 1 99.5 84.2 95.3
1.0-1.9 50 51 74-5 70.9 84.8
2.0-2.9 35 86 57.0 59.7 72.4
3.0-3.9 28 114 43.o 50.3 60.0
4.0-4.9 11 125 37.5 42.3 48.7
5.0-5.9 20 145 27.5 35.6 3g.9
6.0-6.9 7 152 24.0 30.0 30.7
7.0-7.9 11 163 19.5 25.3 23.9
8.0-8.9 5 168 16.0 21.3 13.5
9.0-9.9 3 171 14.5 17.9 14.3
10.0-10.9 4 175 12.5 15.1 10.9
11.0-11.9 2 177 11.5 12.7 8.3
12.0-12.9 4 181 9.5 • 10.7 6.2
13.0-13.9 2 183 8.5 9.0 4.7
14.0-14.9 3 186 7.0 7.6 3.5
1.s 15 14 200 0.0 - - N=200
TABTR A-13
'OBSERVED AND EXPECTED DISTRIBUTIONS OF HEADWAYS.
COMBINED THROUGH LAMES - DIXON ROAD
CLASS INTERVAL
(SEC)
OBSERVED FREQUENCY
(fo)
CUMULATIVE FREQUENCY
CUMULATIVE FREQUENCY
% OF HEADWAYS GREATER 'l'HAN THE GLUS INTER-VAL UPPER - LIMIT
SHOWN '100% Theo7
retical Poisson
Theo- - retical Erlang (K=2)
M-0.9 47 47 76.5 73.3 87,1
1.0-1.9 59 106 47.0 53.7 64.7
2.0-2.9. 29 135 32.5 39.3 44-3
3.0-3.9 15 150. 25.0 23.8 29.0
13 163 18.5 21.1 18.3
5.0-5.9 lo 173 13.5 15.5 _11.4
6.0-6.9 5 178 11.0 11.3 6.9
7.0-7.9 5 183 8-.5.. 8.3 4.1
8.0-8.9 9 192 4.0. 6.1 2.4
9.0-9.9 3 195 25
10.0-10.9 2 197 1.5. 3.3 0.9
11.0-11.9 2 199 O. 2.4 • 0.5.
.12.0-12.9 0 199• 0.5 1.8 0.3
13.0-13.9 1 200 0.0- 1.3 • 0.2
N=200
86
87
TABLE A-14
OBSERVED AND EXPECTED DISTRIBUTIONS OF HEADWAYS.
COMBINED THROUGH LAESS - ISLINGTON AVE.
•
CLASS INTER VAL
(SEC)
OBSERVED FREQULN C Y
(fo)
CUMULATIVE ii REQUEPICY
CUMULATIVE FREQUEN CY
100%
% OF HE A . DkA YS GREATER THAN THE CLASS INTER - VAL UPPER LIMIT
SHOWN Theo- reti cal Poisson
Theo - retical Erlang , (K=2)
0.0-0.9 44 44 78.0 63.1 76.4
1.0-1.9 75 119 40.5 39.8 45.0
2.0-2.9 33 .152 , 24.0 25.1 23.7
3.0-3.9 18 170 15.0 15.8 11.7
4.0-4.9 9 179 10.5 10.0 5.6
5.0-5.9 9 188 6.0 6.3 2.9
6.0-6.9 6 194 3. 0 •
4.0 1.2
7.0-7.9 1 195 2.5 2.5 0.5
8.0-8.9 2 197 1.5 1.6 0.2
9.0-9.9 2 199 0.5 1.0 0.1
10.0-10.9 0 199 0.5 0.6 0.04
11.0-11.9 1 200 0.0 0.4 0.02
N=200
TABLE A-15
'OBSERVE]) AND EXPECTED DISTRIBUTIONS OF HEADWAYS.
COMBINE]) THROUGH LAWES - DUFFERIN STREET
CLASS INTERVAL
(SEC)
OBSEKVED FREQUE\ICY
(fo)
CUMULATIVE FREQUENCY
CUMULATIVE FREQUFDCY
100%
% OF HEADWAYS , GREATER THAN THE CLASS INTER-VAL UPPER LIMII
SHMN Theo- retical Poisson
Theo-retical Erlang
K=2)
0.0-0.9 0.0-0.9 61 61 69.5 49.1 553.4
1.0-1.9 87 148 26.0 24.1 22.3
2.0-2.9 33 181 9.5 11.8 7.4
3.0-3.9 14_ 195 2.5 5.8 2.2
4.0-4.9 3 198 1.0 2.8 0.7
5.0-5.9 1 199 0.5 1.4 0.2
6.0-6.9 0 199 0.5 0.7 0.05
7.0-7.9 0 199 0.5 0.3 0.01
8.0-8.9 1 200 0.0 0.2 0.004
N=200
88
•
TABLE A-16
OBSERVED AND EXPECTEDDISTRIBUTIONS OF HEADWAYS.
COMBINED THROUGH LANES - AVENUE.ROAD
CLASS INTERVAL
(SEC)
OBSERVED FREQUENCY
(fo)
,CUMULATIVE FREQUENCi,
CUMULATIVE FREQ1D-NCY
100%
% OF HEADWAYS GREATEtt THAN THE CLASS INTER-VAL UPPER LIMIT
SHOUN Theo- retical Poisson
Theo-retical Erlang (K=2)
0.0-0.9 62 62 69.0. 48.1 56.9
1.0-1.9 95 157 21.5 23.1 21.0 .
2.0-2.9 26 183 8.5 11.1 6.6
3.0-3.9 9 192 4.0 5.3 1.9
4.0-4.9 4 196 2.0 2.6 o.6
5.0-5.9 2 198 1.0 1.2 02
6.0-6.9 1 199 0.5 0.6 0.05
7.0-7.9 1 • 200 0.0 0.3 0.01
N=200
89
APPENDIX "B"
Curves of observed and theoretical distributions of Headways at ail study locations.
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E-1
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Cf,
15 20
APPENDIX 'C"
Cives (plotted on semi-log paper) of.observed and theoretioal distri-butions of Headways-at ail study locations'.
108
HEADWAY T SEC
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3
2
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3
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4
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12
HEADWAY, T SEC
i 2d •
4
t_-
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5
DI TRiinTiON OF HEADiTÀ7È ' DECELERATION HirOURLY VOL . •
4
DBSERVEil_II1S-WRIBUT_1031
110
LANE - DWO-N ROAD'
«lem 414.04 4o.m.
3 -
•
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trHEORETICA2e pISTRIBUTION RANGE OF, NATURALT UNG-ERTA-T-N-VP '
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9
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DISTRIBUTION ;01e 11EADV,liti.YS (+TON AVE ' MIVING. LANE- ..' ISLII\
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2 6 8 10 12 HEADWAY, T SEC.
5
4
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112
:77DISTR—RUTION'OF HEAD AIS. • i. T411_10iFNU
TR0ÙRLY:VOLUME1 TEE = 1096 VPU 1
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113
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114
9
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DISTRIEJTION OF: f3.3ApliAirS-1 • Z,biG L"; DUFFE'n'UN;
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115
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,APPENDIX 'D"
Tables of Chi-Square Tests when fitting observed data to Poisson and Erlang (1.2) distributions.
MS 111111 IBN OBI 11111 MIN MI 1•111 MB IBN NB IIIMI MM
TABLE D-1
CHI-SQUARE TEST TO CBECK THE GOODNESS OF FIT OF POISSON DISTRIBUTION TO OBSERVED DATA:
DRIVING LANE - DIXON ROM)
CLASS INTERVAL
(SEC)
OBSERVED FREQUENCY
(fo)
PROBABILITY (POISSON)
THEORETICAL FREQUENCY
(fT) (fo-fT) (fo-fT)2 (fo-fT)2
fT
0.0-0.9 1 0.1193
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Cel
c'r\ 0 s.0
C\I 111
s.0 C\I C\1
H cp
529 22.04 1.0-1.9 24 0.1050 9 0.43 2.0-2.9 19 0.0925 0 0.00 3.0-3.9 22 0.0815 36 2.25 4.0-4.9 18 0.0718 16 1.14 5.0-5.9 8 0.0632 25 1.92 6.0-6.9 13 0.0555 4 0.36 7.0-7.9 15 0.0491 25 2.50 8.0-8.9 16 0.0431 49 5.44 9.0-9.9 8 0.0381 0 0.00
10.0-10.9 13 0.0335 36 5.14 11.0-11.9 4 0.0295 4 0.67 12.0-12.9 7 0.0259 4 0.80 13.0-13.9 6 0.0229 1 0.20 14..p-14.9 7 i 0.0202 1.88
D.e 15 26 19 0.1488 64 N=200 Z 41 )1.77
=27.69 x2 (13,0.01)
44.77 >27.69 Poisson does not fit at the 1% significance level.
MI MI MM IBM Mill 1•11 MIN Mil MI MM MI MM
TABLE D-2
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF ERLANG (K=2) DISTRIBUTTON TO OBSERVED DATA:
DRIVING LANE - DIXON ROAD
CLASS INTMVAL
(SEC)
OBSERWED FREQUENCY
(fo)
PROBABILITY (ERLANG) (K=2)
THEORETICAL FREQUENCY
(fT) (fo-fT) (fo-fT)2 (fo-fT)2
fT
0.0-0.9 1 0.0273 5
-d-H (NI ‘Y-1 0
Ocr l H el
(-(1-..- 0
O N
(NI H
H
16 3.20 1.0-1.9 24 0.0653 13 121 9.31 2.0-2.9 19 0.0851 17 4 0.24 3.0-3.9 22 0.0925 19 9 0.47 4.0-4.9 18 0.0924 18 o 0.00 5.0-5.9 8 0.0877 18 100 5.56 6.0-6.9 13 0.0802 16 9 0.56 7.0-7.9 15 0.0720 14 1 0.07 8.0-8.9 16 0.0633 13 9 0.69 9.0-9.9 8 0.0549 11 9 0.82 10.0-10.9 13 0.0471 9 16 1.78 11.0-11.9 4 0.01 0 8 16 2.00 12.0-12.9 7 0.0336 7 o 0.00 13.0-13.9 6 0.0285 6 o 0.00 14.0-14.9 7 0.0235 5 4 0.80
5;15 19 0.1063 21 4 0.19 N=200 I:=25.69
X2(14,0.01) = 29°14
25.69 429.14 Erlang fits at the 1% significance level.
0",
Rio WB ma lm immi au lm mi mu au lm mi dm mi lm lm mu
TABLE D-.3
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF POISSON DISTRIBUTION TO OBSEEVED DATA:
PASSING LANE - DIXON ROAD
CLASS INTERVAL
(SEC)
OBSERVED FREQUENCY
(fo)
PROBUILITY (POISSON)
THEORETICAL FREQUENCY
(fT) (fo-fT) (fo-fT)2 (fo-fT)2
fT
0.0-0.9 15 0.1664 33
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f\)
H H U
3 N
HN
O C
o-P-
CO C
D 32à 9.82 1.0-1.9 56 0.1387 28 784 28.00 2.0-2.9 27 0.1156 23 16 0.70 3.0-3.9 11 0.0964 19 64 3.37 4.0-4.9 5.0-5.9
16 11
o.08011 0.0670
16 13
o 4
0.00 0.31
6.0-6.9 12 0.0558 11 1 0.09 7.0-7.9 7 0.01165 9
à 2.00 8.0-8.9 4 0.0388 8 9.0-9.9 lo 0.0324 7 9 1.29
10.0-10.9 4 0.0269 5 1 0.20 11.0-11.9 4 0.0225 5 1 0.20 12.0-12.9 13.0-13.9 1à.0-14.9
Ili 3)
8 0.0187 0.0157 0.0130
4 3 10 3
4 0.40
ei5 15 0.0652 13 4 0.31 N=200 Z =47.13
X2 (12,0,01)
47.13 >26.22 Poisson does 'not fit at the 1% significance level.
MI MM Mill Mil MM MI »I MI Mill ail MI Mal MOI
TABLE D-4
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF LhLANG (K=2) DISTRIBUTION TO OBSERVE]) DATA:
pAssING.LANE - DIXON RoAD
CLASS INTERVAL
(SEC)
OBSERVE]) FREQUENCY (fo)
PROBABILITY (ERLANG)
(K=2)
THEORETICAL FREQUENCY
(fT) (fo-fT) ( -fT)2 (fo-rie
fT
0.0-0.9 15 0.0522 10 5 25 2.50 1.0-1.9 56 0.1133 23 33 1089 47.35 2.0-2.9 27 0.1326 27 o o 0.00 3.0-3.9 11 0.1292 26 15 225 8.65 4.0-4.9 16 0.1159 23 7 4-9 2.13 5.0-5.9 11 0.0983 20 9 dl 4.05 6.0-6.9 12 0.0810 16 16 1.00 7.0-7.9 7 0.0647 13 6 36 2.77 8.0-8.9 4 0.0490 lo 6 36 3.60 9.0-9.9 10 0.0418 8 2 4 0.50
10.0-10.9 4 0.0309 6 2 4 0.67 11.0-11.9 4 0.0229 5 1 1 0.20 12.0-12.9 0.0178 4 13.0-13.9 1
4 V 0.0132 3 9 1 1 0.11
14.0-14.9 e15
3 15
0.0094 0.0278
2 6 9 81 13.50
N=200 Z=87.03
2 X (12,0.01) = 26.22
87.03 >26.22 .> Erlang does not fit at the 1% significance level.
MI MM Mil MI MI MI OBI MM MN IBM MI 1111M MI" Mil Un MM
TABLE D-5
CHI-SQUARE 'I.ST TO CHECK THE GOODNESS OF 'FIT OF POISSON DISTI-ŒBUTION TO OBSERVED DATA:
DECELERATION.LANE - DIXON ROAD
CLASS INTERVAL
(SEC)
OBSERVED FREQUENCY
(fo)
PROBABILITY (POISSON)
THEMETICAL FREQUENCY
(fT) (fo-fT) 2 (fo-fT) (fo-fT)2
fT
0.0-0.9 5 0.2094 42 37 1369 32.60 1.0-1.9 63 0.1656 33 30 900 27.27
2.0-2.9 42 0.1309 26 16 256 9.85 3.0-3.9 4.0-4.9
25 12
0.1035 0.0818
21 16
L. 4
16 16
0.76 1.00
5.0-5.9 6.0-6.9
9 10
0.0647 0.0511
13 10
4 o
16 0
1.23 0.00
7.0-7.9 5 0.0404 8 3 9 1.13 8.0-8.9 5 0.0320 7 2 4 0.57
9.0-9.9 5 0.0252 5 o o 0.00 10.0-10.9 4 0.0200 4 11.0-11.9 3 0.0158 3 12.0-12.9 3 16 0.0120 2 13 3 9 0.69 13.0-13.9 5 0.0103 2 14.0-1)1.9 1 0.0079 2
e 15 3 . o2 94 6 3 9 1.50 N=200 2E=76.60
X2 (10,0•01) = 23.21
76.60 >23.21 Poisson does.not fit at the 1% significance level.
MW Mil MIN IBM MI Mal OMM IIIIIII URI MI 1111111 MI MIS Nal Mil 111111 MM
TABIE D-6
CHI-SQUARE TEST 5D CHECK THE GOODNESS OF FIT OF ERLANG (K=2) DISTRIBUTION TO OBSERVED DATA:
DECELERATION LANE - DIXON ROAD
CLASS INTERVAL (SEC)
OBSERVED FREQUENCY (fo)
PROBABILITY (LhLANG) (K=2)
THEORETICAL FREQUENCY
(fT) (fo-fT) (fo-fT) 2 (fo-fT) 2
fT 0.0-0.9 5 0.0812
\A-) o
o -p
-
H
H
11 121 7.56 1.0-1.9 63 0.1610 31 961 30.03 2.0-2.9 42 0.1695 8 64 1.88 3.0-3.9 25 0.1488 5 25 0.84 4.0-4.9 5.0-5.9
12 9
0.1199 0.0919
12 9
6.00 4.50
141
6.0-6.9 10 0.0677 4 16 1.14 7.0-7.9 5 0.0491 5 25 2.50 8.0-8.9 5 0.0345 2 4 0.57 9.0-9.9 5 0.0245 o o 0.00
10.0-10.9 4 0.0167 11.0-11.9 3 0.0113 12.0-12.9 3 19 0.0083 8 64 5.82 13.0-13.9 5 0.0050 14.0-14.9 1 0.0034
3;1.5 3 0.0072 N=200 X=60.84
X2(9,0.01) = 21.67
60.84 >21.67 Erletx;does not fit at the 1% significance level.
MIN UN 1111111 MM MIS MM Mi Mil UNI Mill MM MM 11•11 Mi
TABLE D-7
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF POISSON DISTRIBUTION TO OBSERVED DATA:
DRIVING LANE - ISLINGTON AVE.
CLASS INTERVAL (SEC)
OBSERVED FREQUENCY (fa)
PROBABILITY (POISSON)
THEORETICAL FREQUENCY
(f T) (fo-fT) (fo-fT)2 (fo-fT)2
fT
0.0-0.9 1 0.14/01
-
I cy\ Ir\ c‘i co
,0 c-n
H O
c0 t‘•-•.0 \
N
NN
H
NN
NH
HH
HH
CO 0 CO
CO N
H
H H
crl,.0 N
H H
784 27.03 1.0-1.9 15 0.123S 100 4.00 2.0-2.9 30 0.1057 64 2.91 3.0-3.9 4.0-4.9
36 18
0.0905 0.0774
324 4
18.00 0.25
5.0-5.9 20 0.0662 49 3.77 6.0-6.9 15 0.0567 16 0.36 7.0-7.9 9 0.0484 1 0.10 8.0-8.9 9 0.0415 1 0.13 9.0-9.9 6 0.0355 1 0.14 10.0-10.9 9 0.0303 9 1.50 11.0-11.9 11 0.0260 36 7.20 12.0-12.9 3 0.0222 13.0-13.9 7 0.0190 14.0-14.9 2 0.0163 15.0-15.9 1 21 0.0139 0 0.00 16.0-16.9 2 0.0119 17.0-17.9 1 0.0102 18,0-13.9 3 0.0087 19.0-19.9 2 0.0074
N=200 r=65.39
,2 = 24.73
65.39 >24.73 Poisson does not fit at the % significance level,
1111/ IIIIIII 1111.11 MN Ili MM UNI I» Mil lila
TABLE D-8
CHI-SQUARE TEST TO CHECK TEE GOODNESS OF FIT OF ERLANG (K=2) DISTRIBUTION TO OBS-à),VED DA,TA:
DRIVING LANE - ISLINGTON AVE.
CLASS INTERVAL
(SEC)
OBSERVED FREQUEIICY
(fo)
PROBABILITY (ERLANG)
(K=2 )
THEORETICAL FREQUENCY
(fT) (f0-fT)
2 (fo-fT) (fo-fT)2 fT
0.0-0.9 1 0.0397 8 7 à9 6.13 1.0-1.9 15 0.0902 18 3 9 0.50 2.0-2.9 30 0.1108 22 8 64 2.91 3.0-3.9 36 0.1139 23 13 169 7.35 4.04 .9 18 0.1075 22 4 16 0.73 .0-5.9 20 0.0962 19 1 1 0.05
0.0-6.9 15 0.0332 17 2 4 0.2h 7.0-7.9 9 0.0704 14 5 25 1.79 8.0-8.9 9 0.0585 11 2 4 0.36 9.0-9.9 6 0.0475 9 3 9 1.00
10.0-10.9 9 0.0385 7 2 4 0.57 11.0-11.9 11 0.0316 6 5 25 4.17 12.0-12.9 3 0.0245 4 13.0-13.9 7 0.0193 3 14.0-14.9 2 0.0154 3 17 4 16 0.94 15.0-15.9 1 21 0.0121 2 16.0-16.9 2 0.0092 2 17.0-17.9 1 0.0077 1 18.0-18.9 3 0.0051 1 19.0-19.9 2 0.0049 1
N =200 1=26.74
2 , " (11,0.01) = 24.73
26.74 > 24.73 Erlang does not fit at the 1% significance level.
OUI SM MIS Mi MM UN MINI Mill MI IIIIIII MI OMM MM OMO OUI 11111 il! MI
TABIE D-9
CRI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF POISSON DISTRIBUTION TOOBSERVED DATA:
PASSING LANE - ISLINGTON AVE.
CLASS INTERVAL
(SEC)
OBSERVED FREQUENCY
fo
PROBABILITY (POISSON)
THEORETICAL FREQUENCY
(fT) (fo-fT) (fo-fT)2 (fo-fT)2
fT 0.0-0.9 1.0-109 2.0-2.9 3.0-3.9 4.0-4.9 5.0-5.9 6.0-6.9 7.0-7.9 8.0-8.9 9.0-9,9
10.0-10.9 11.0-11.9 12.0-12.9 13.0-1309 14.0-14.9 15.0-15.9 16.0-16.9 17.0-17.9 18.0-18.9 19.0-19.9
4
12 77 35 19 16 10
8 8 3 3 1 3 1 0 1 1 1 0 o
1
12
0.2629 0.1937 0.1429 0.1053 0.0776 - 0.0572 0.0422 0.0310 0.0230 0.0168 0.0127 0.0090 0.0068 0.0049 0.0037 -0.0027 0.0020 0.0015 0.,0011 0.0008
53 39 29 21 15
-11 8 6 5 3 3 2 1 1 1 1 0 o o o
12
r---- .0 C\I r-1
1-1 N N
O
1681 1111111
31.72 37.03 1.24
, 0.19 0.07 0.09 0000 0.67 0.80
0.00
36 4 1 1 o 4 4
0
N=200 Z=71.81
X2
(8,0.01) = 20.09
71.81 > 20.09 Poisson does not fit at the 1% significance level.
1-à Lx) U.)
Mi MM Mil Mil IIMII MIS MI IIIIIII MM MM Mil MI IVO Mill Mlle MOI
TABLE D-10
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF ERLANG (K=2) DISTRIBUTION TO OBSERVED DATA:
PASSING LANE - ISLINGTON AVE.
CLASS INTERVAL
(SEC)
OBSERVED FREQUENCY
(fo)
PROBABILITY (ERLANG)
(K=gi_
THEORETICAL FREQUENCY
fT (fo-fT) (fo-fT)2 (fo-fT)2
fT 0.0-0.9 12 0.1251 25 13 169 6.76 1.0-1.9 77 0.2196 4)i 33 1089 2)4.75 2.0-2.9 35 0.2013 4o 5 25 0.63 3.0-3.9 19 0.1540 31 12 144 4.65
25 16
4.0-4.9 5.0-5.9
16 lo
0.1080 0.0722
21 14
5 L ,4 1.19 1.14
6.0-6.9 8 0.0460 9 1 1 0.14 7.0-7.9 8 0.0291 6 2 4 0.67 8.0-8.9 3 0.0181 4 9.0-9.9 -3 0.0110 2
10.0-10.9 1 0.0063 1 11.0-11.9 3 0.0045 1 12.0-12.9 1 0.0022 0 13.0-13.9 0 15 0.0017 8 7 Lj..9 6.13 14.0-14.9 1 0.0009 o 15.0-15.9 1 0.00°4 o 16.0-16.9 1 0.0003 o 17.0-17.9 o 0.0001 o 18.0-18.9 o 0.0001 o 19.0-19.9 1 0.00003 o
N=200. . 1E=46 .06
,2 = 18.48 (7,0.01) 1-1
46.06 >18.48 Erlang does not fit at the 1% significance levai.
MINI IIIIIII MI MI MINI MOI MI Mal Mil Mal 111111 1111•11 RIB- -MM Mill Mill Ni
TABLE D-11
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT CF POISSON DISTRIBUTION TO OBSERVED DATA:
DECELERATION LANE - ISLINGTON AVE.
CLASS INTERVAL
SEC
oBSorTED FREQUENGY
fo
"OreBILITY (POISSON)
THEOnETICAL FREQUENCY
(fT) (fo-fT) (fo-fT) (fo-fT)2
fT
0.0-0.9 1 0.1706 34 33 1089 32.03 1.0-1.9 43 0.1414 28 15 225 8.04 2.0-2.9 47 0.1174 24 23 529 22.04 3.0-3.9 25 0.0973 19 6 36 1.89 4.0-4.9 5.0-5.9
18 15
0.0807 0.0670
16 13
2 2
4 4
0.25 0.31
6.0-6.9 12 0.0555 11 1 1 0.09 7.0-7.9 10 0.0461 9 1 1 0.11 8.0-8.9 7 0.0382 8 1 1 0.13 9.0-9.9 2 0.0317 6 4 16 2.67
10.0-10.9 2 0.0263 5 3 9 1.80 11.0-11.9 3 0.0218 4 12.0-12.9 2 0.0181 4 \ 13 5 25 1.92 13.0-13.9 2 \ 8 0.0150 3 14.0-14.9 1 0.0124 2
e 15 10 0.0605 12 2 4 0.33 N=200 =71.61]E
X2
(11,0.01) = 24.73 71.61 >24.73 Poisson does not fit at the 1% significance leve1.
nal MB 11111 MM MB MI MI MB IBM WIN NB MB MB 111111 1111111
TABLE D-12
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF ERLANG (K=2) DISTRIBUTION TO OBSERVED DATA:
DECELERATION LANE - ISLINGTON AVE.
CLASS INTERVAL
(SEC)
OBSERVED FREQUINCY
(fo)
PROBABILITY (ELLANG)
(K=2)
TERORETICAL FREQUENCY
(fT) (fo-fT) (fo-fT) 2 (fo-fT) 2
fT
0.0-0.9 1 0.0547
(\I
N-1
) crl
\O GO
•0 d
ce
('J U
\ H
C\J C
\J (N.1 C‘.I
(-1 H
r-I
10 100 9.09 1.0-1.9 43 0.1180 19 361 15.04 2.0-2.9 47 0.1364 20 400 14.81 3.0-3.9 25 0.1313 1 1 0.04 4.044.9 18 0.1168 5 25 1.09 5.0-5.9 15 0.0984 5 25 1.25 6.0-6.9 12 0.0801 4 16 1.00 7.0-7.9 10 0.0634 3 9 0.69 8.0-8.9 7 0.0498 3 9 0.90 9.0-9.9 2 0.0378 6 36 4.50
10.0-10.9 2 0.0294 4 16 2.67 11.0-11.9 3 0.0219 12.0-12.9 2 0.0158 13.0-13.9 2/ 8 0.0126 4 16 1.33 14.0-14.9 1 0.0086
e:15 10 0.0245 5 25 5.00 N=200 2 =57.41
,2 X (11,0.01) 24.73
57.41 >24.73 -Erlang does not,fit at the 1% significance level.
MI lin Mil MI 1•11 1311 1•11 8Z11 1111111 1•11 MM MB MI 11•1
TABLE D-13
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF POISSON DISTRIBUTION TO OBSERVED DATA:
DRIVING LANE - DUFFERIN ST.
CLASS INTERVAL
(SEC)
OBSERVED FREQUENCY
(fo)
PROBABILITY (POISSON)
Tliki;ORETICAL FREQUENCY
(fT) f -fT) ( -fT) (fo-fT)2
fT
0.0-0.9 3 0.2313 46 43 1849 40.20 1.0-1.9 51 0.1777 36 15 225 6.25 2.0-2.9 72 0.1367 27 45 2o25 75.00 3.0-3.9 20 0.1051 21' 1 1 0.05 4.0-4.9 16 0.0807 16 o o 0.00 5.0-5.9 7 0.0621 12 5 25 2.08 6.0-6.9 11 0.0477 10 1 1 0.10 7.0-7.9 6 0.0367 7 1 1 0.14 8.0-8.9 5 0.0282 6 1 1 0.17 9.0-9.9 3 0.0217 4
10.0-10.9 2 0.0167 3 11.0-11.9 12.0-12.9
1 1 9
0.0128 0.0099
3 ].5 2 6 36 2 .40
13.0-13.9 0 0.0075 2 14.0-14.9 2 0.0059 1
N=200 E=127.39
2 X (8,0.01) = 20.09 127.39 >20.09 Poisson does not fit at the 1% significance level.
UNI MM MINI 1MM 1M1 Mal MB IBM 1M11 MB Inn MI MI Mn
TABLE D-14
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF ERLANG (K=2) DISTRIBUTION TO OBSERVED DATA:
DRIVING LANE - DUFFERIN ST.
CLASS INTERVAL
(SEC)
OBSERVED FREQUENCY
(fo)
PROBABILITY (ERLA.HG)
(K=2)
TH1,11 0RETICAL FREQUENCY
(fT) (fo-f ) (fo-fT)2 (fo-fT) 2
fT
0.0-0.9 1.0-1.9
3 51
0.0931 o.1853
20 37
17 14
289 196
14.45 5.30
2.0-2.9 72 0.1845 39 33 1089 27.92 3.0-3.9 20 0.1534 31 11 121 3.90 4.0-4.9 16 0.1170 23 7 49 2.13 5.0-5.9 7 0.0847 17 10 100 5.88 6.0-6.9 11 0.0590 12 1 1 0.08 7.0-7.9 6 0.0409 8 2 4 0.50 8.0-8.9 5 0.0266 5 o o 0.00 9.0-9.9 3 0.0179 4
10.0-10.9 2 0.0122 2 11.0-11.9 1 9 0.0072 1 9 0 0 0.00 12.0-12.9 1
1 0.0046 1
13.0-13.9 0 0.0036 1 14.0-14.9 2 0.0014 0
N=200 1=60.16
x2= 20.09
60;16 >20.09 Erlang does not fit at the 1% significance leve1.
Mill MINI 11111 MI MIN Mil MI 11•11 IMIM RIB
TABLE D-15
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF POISSON DISTRIBUTION TO OBSERTM DATA:
PASSING LANE - DUFFERIN ST.
CLASS INTERVAL
(SEC)
OBSERVED FREQUENCY
(fo)
PROBABILITY (POISSON)
THEORETICAL FREQUENCY
(fT) f -fT) (f0-fT)2 (fo-fT)2
fT
0.0-0.9 1.0-1.9 2.0-2.9 3.0-3.9 4.0-4.9 5.0-5.9 6.0-6.9 7.0-7.9 8.0-8.9
15 87 55 26 10 4 0
il 3
0.3611 0.2307 0.1474 0.0942 0.0601 o.o385 0.0245 0.0158 0.0100
C‘I O
'N as C
O If \ cr ‘N
C
r-i
57 41 26 7 2 4 5 2
3249 1681 676 49
à 25
4
45.13 36.54 23.31 2.58 0.33 2.00 5.00 0.8o
N=200 1:=115.69
2 v — (6,0.01) = 16.81
115.69 > 16.81 Poisson does not fit at the 1% significance level.
ma ma am am am ma am am mi am am am mic am ma am ami
TABLE l>16.
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF ERLANG (K=2) DISTRIBUTION TO OBSERVED DATA:
PASSING LANE - DUFFERIN ST.
CLASS INTERVAL
(SEC)
OBSERVED FREQUENCY
(fo)
PROBABILITY (ERLAUG) (K=2)
THEORETICAL FREQUENCY
(fT) (fo-fT) (fo-fT)
2 (fo-fT) 2
fT
0.0-0.9 15 0.2261 45 30 900 20.00 1.0-1.9 87 0.3088 62 25 625 lo.o8 2.0-2.9 55 0.2143 43 12 lhh 3.35 3.0-3.9 26 0.1238 25 1 1 o.04 L0-4.9 10 0.0651 13 3 9 0.69 5.0-5.9 4 0.0326 7 3 9 1.29 6.0-6.9 0 0.0155 3 7.0-7.9 2)3 0.0073 2 i 6 3 9 1.50 3.0-8.9 i3 0.0056 1
N=200 1=36.95
2 v " (5,0.01) 7 15.09
36.95 > 15.09 Erlang does not fit at the 1% significance
Mil MINI 1•111 11111111 1•11 111111 Mil MM Mill OMM
TABLE D-17
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF POISSON DISIUIBUTION TO OBSERVED DATA:
DECELERAT ION LANE - DUFFERIN ST.
CLASS INTERVAL
(SEC)
OBSERVED FREQUENCY
(fo)
PROBABTF,ITY (POISSON)
THEORETICAL FREQUENCY
(fT) fo-fT) ( -fT)2 (fo-fT) 2
fm 0.0-0.9 1 0.0870 15 14 196 13.07 1.0-1.9 13 0.0794 1)1 1 1 0.07 2.0-2.9 15 0.0725 13 2 4 0.31 3.0-3.9 21 0.0662 11 10 100 9.09
8 0.0605 10 2 4 0.40 5.0-5.9 13 0.0551 9 4 16 1.78 6.0-6.9 10 0.05014 9 1 1 0.11 7.0-7.9 6 0.0460 8 2 4 0.50 8.0-8.9 12 0.0420 7 5 25 3.57 9.0-9.9 6 0.0384 7 1 1 0.14
10.0-10.9 7 0.0350 6 1 1 0.17 11.0-11.9 8 0.0320 6 2 Li 0.67 12.0-12.9 4 0.0291 5 1 1 0.20 13.0-13.9 5 0.0267 5 o o 0.00 14.0-1)1 .9
e 15 71
371 44 0.0243 0.2554
4 1 45 I 49
5 25 0.51
N.173 2:=30.59
X2(13,0.01) = 27.69
30.59 >27.69 Poisson does not fit at the 1% significance level. -P-
11111 111M1 ION 11111 MI 111111 MI an BIR Bal MB an MB NUI MB lin BU
TABLE D-18'
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF ERLANG (K=2) DISTRIBUTION TO OBSERVED DATA:
DECELERATION LAUE - DUtiVERIN ST.
GLUS I DITERVAL I (SEC)
OBSERVED FREQUENCY
(fo)
PROBABILITY (ERLANG)
(K=2)
THEORETICAL FREQUEUCY (fT)
(fo-fT) (fo-fT)2 (fo-fT)2 fT
0.0-0.9 1.0-1.9
1 t 14 13 0.0147 0.0375
C.- - O• H
H R..1
H H
0 0
0• CO
(\J
H H
H r-I H
H H
1
\71
K) l,-)O
FV-P-
R.)\
-r11-
1 1--'W
O 0"
16 1.60
2.0-2.9 15 0.0522 36 4.00 3.0-3.9 21 0.0611 100 9.09 4.0-4.9 8 0.0657 9 0.82 5.0-5.9 13 0.0669 1 0.36 6.0-6.9 10 0.0659 1 0.09 7.0-7.9 6 0.0633 25 2.27 8,0-8.9 12 0.0599 4 0.40 9.0-9.9 6 0.0560 16 1.60
10.0-10.9 7 0.0512 4 0.44 11.0-11.9 8 0.0h71 o 0.00 12.0-12.9 h 0.0424 9 1.29 13.0-13.9 5 0.0386 4 0.57 14.0-14.9 7 0.0343 1 0.17
37 0.21i32 , 25 0.60 N.173 2:=23.30
2- 27 ° 69
23.30 427.69 Erlang fits at'the I% significance level.
Mn 111111 MB lila 111111 MI MB an MI 11111 1111111 1M11 11•11 nal MI
- TABLE D-19
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF POISSON DISTRIBUTION TO OBSERVED DATA:
DRIVING LANE - AVENUE ROAD
CLASS INTERVAL .
(SEC)
OBSERVED FREQUENCY
(fo)
PROBABILIT/. (POISSON)
THEORETICAL FREQUENC/
(f T) (fo-2T) (fo-fT)2 (fo-fT)2
fT 0.0-0.9
n
cnco
H H U
1N
11\--
- N
g-1 r-I
0.2212 44 41_ 1681 38.20 1.0-1.9 0.1660= 33 16 256 7.- 76 2.0-2.9 0.1312 26 17 289 11.12 3.0-3.9 0.1035 21 7 49 2.33 4.0-4.9 0.0818 16 5 25 1.56 5.0-5.9 0.0646 13 2 ' 4 ç 0.31 6.0-6.9 0.0510- 10 5 25 2.50 7.0-7.9 0.0403 8 4 16 200 8.0-8.9 0.0318 6 1 1 0.17 9.0-9.9 0.0252 5 1 1 0.20
10.0-10.9 0.0198 4 11.0-119 0.0157 3 . 12.0-12.9 0.0125 3 13.0-13.9 0.0097 2 16 7 49 3.06 14.0-14.9 '0.0077 2 15.0-15.9 0.0061 1 16.0-16.9 0.0048 1
]:=69.21
X2(9,0.01) = 21.67 69.21 > 21.67 *)* Poisson does not fit at the 1% significance level.
Mill Mill MM MM IM 1•111 111111 MI MI MI MM Mal MI Mal IBM Bill
TABLE D-20
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF ERLANG (K=2) DISTRIBUTION TO OBSERVED DATA:
DRIVIM LANE - AVENUE ROAD
CLASS OBSERVED PROBABILITY THEORETICAL INTERVAL FREQUENCY (ERLANG) FREQUENCY (fo-fT) -fT)2 (fo-fT)2 (SEC) (fo) K=2 (fT) fT 0.0-0.9 1.0-1.9 2.0-2.9 3.0-3.9 LL.0-4.9 5.0-5.9 6.0-6.9
3 49 43 28 21 11 15
o.0880 0.1556 0.1700 0.1492 0.1200 0.0915 0.0677
18 31 34 30 24 18 14
15 18 9 2 3 7 1
225 324 81 4 9
/4-9 1
12.50 10.45 2.38 0.13 0.38 2.72 0.07 7.0-7.9
8.0-8.9 9.0-9.9
12 5 4
0.0486 0.03wp 0.0241
10 7 5
2 2 1
4 4 1
0.40 0.57 0.20 10.0-10.9 1 0.0162 3'
11.0-11.9 2 0.0120 2 12.0-12.9 0 0.0070 1 13.0-13.9 14.0-14.9
2 9. 0.0058 0.0034
1 1
9 o 0. 0.00
15.0-15.9 21 1 0.0022 1
16.0-16.9 1 0.0016 0 N=200 1:=29.80 -
X2'(9,0.01) = 21.67
29.30 >21.67 Erlang does flot fit at the 1% significance level.
111111 Inn MB IMBI MIN MM
TABLE D-21
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF POISSON DISTRIBUTION TO OBSERVED DATA:
PASSING LANE - AVENUE ROAD
CLASS INTERVAL
(SEC)
OBSERVhD FREQUENCY
(fo)
PROBABILITY (POISSON)
THEORETICAL FREQUE£Y
(fT) fo-fT) (fo-fT)2 (fo-fT)2
fT
0.0-0.9 1.0-1.9 2.0-2.9 3.0-3.9 4.0-4.9 5.0-5.9 6.0-6.9 7.0-7.9 8.0-8.9 9.0-9.9
10.0-10.9 11.0-11.9 12.0-12.9
a 43 14
6 2 2 2 0 0 o o 1
5
0.3923 0.2383 0.1)01 9 0.0881 0.0535 0.0325 0.0197 0.0121 0.0073
0.00)1 4 0.0028 0.0016 0.0010
78 48 30 18 11
7 4 2 2 1 1 o 0
•
10
64 68 13 4 5
, 5
5
4096 4624 169 16 25 25
25
52.51 96.33 5.63 0.89 2.27 3.57
2.50
N=200 1=163.70
15.09
163.70 )1.15.09 Poisson does not fit at the 1% significance level.
MB Bal Mail IMMI IBN Inn BU Mal Bal MI MB MI MB Bal MM Mill Mail
TABLE D-22
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF ERLANG (K=2) DISTRIBUTION TO OBSERVED DATA:
PASSING LANE - AVENUE ROAD
CLASS OBSERV1D PROBABILITY THEORETICAT, 2 INTERVAL YREQUENCY (ERLANG) FREQUaTCY (fo-fT) (fo-fT)2 (fo-fT)
fT (SEC) (fo) (K=2) (fT)
0.0-0.9 0.2627 53 39 1521 28.70 1.0-1.9 a 0.3292 66 50 2500 37.88 2.0-2.9 43 0.2071 41 2 4. 0.10 3.0-3.9 14 0.1083= 22 8 64 2.91
1.60 4.0-4.9 6 0.051)1 10 4 16 5.0-5.9 2 0.0239 5 6.0-6.9 2 0.0102 2 7.0-7.9 2 0.0045 1 8.0-8.9 0 7 0.0017 0 8 1 1 0.13 9.0-9.9 0 0.0005 0 10.0-10.9 0 0.0003 0 11.0-11.9 0 0.0001 0 12.0-12.9 1 0.00006 0
N=200 • 1:=71.32
X2(4,0.01) = 13.28
71.32 >13.28 Erlang doeà not fit àt the 1% significance level.
MM Mi Mill Mil lila Mil MI Mil Mill MI IBM IBM 11111 Mil MM
TABLE D-23
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF POISSON DISTRIBUTION TO OBSERVED DATA:
DEC7TŒRATI0N LANE - AVENwl: ROAD
CLASS INTERVAL
(SEC)
OBSERVED FREQUENCY
(fo)
PROBABILITY (POISSON)
THEORElICAL FREQU7N- CY
(fT) (fo-fT) (fo-fT)2 (fo-fT)2
fT
0.0-0.9 1 o.1680
o
••••••••"..".%
G• •.0 C
r\ H 0 C
O £
'-"O
Crl C
C\I r-I r-I f--1
r-I r-I
33 1089 32.03 1.0-1.9 50 0.1331 23 529 19.59 2.0-2.9 35 0.1120 13 169 7.68 3.0-3.9 23 0.0943 9 81 4.26 4.0-4.9 11 0.0794 5 25 1.56 5.0-5.9 20 0.0669 7 49 3.77 6.0-6.9 7 o.o563 4 16 1.45 7.o-7.9 11 0.0474 1 1 0.10 8.0-8.9 9.0-9.9
5 3
0.0399 0.0336
3 4
9 16
1.13 2.29
10.0-10.9 11.0-11.9
4 2
0.0283 0.0239
2 3
4 9
0.67 1.8o
12.0-12.9 4 0.0200 13.0-13.9 2 i9 0.0169 1 1 0.10 14.0-14.9 els 3
14 0.0142 0.0758 1 1 0.07
N=200 1.=76.50
X2 = 26.22 (12,0.01) 76.50 >26.22 Poisson does flot fit at the 1% significance level.
11111111 Mil MM MI MIR IMIII MM MM MI MIR MI Mill MI MM MI
TABLE D-24
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF ERLANG (K=2) DISTRIBUTION TO OBSERVED DATA:
DECELERATION LANE - AVENUE ROAD
CLASS INnevAL
(SEC)
OBSEttVED FREQUENCY
(fo)
PROBABILTTY (ERLANG)
(K=2)
THEORETICAL YREQUENCY
(fT) (fo-fT) (fo-fT)2 (fo-fT)2
fT 0.0-0.9 1 0.0472
--N1
[MW
,4)
o• 0
VIA
- Ft 1 -
1 •0 8 64 7.11
1.0-1.9 50 0.10101 29 841 40.05 2.0-2.9 35 O.12L4 10 100 4.00 3.0-3.9 28 0.1238 3 9 0.36 4.0-4.9 11 0.1130 12 /l4. 6.26 5.o-5.9 20 0.0984 0 0 0.00 6.0-6.9 7 0.0821 9 81 5.06 7.0-7.9 11 0.0673 2 4 0.31 8.0-8.9 5 0.0543 6 36 3.27 9.0-9.9 3 0.o426 6 36 4.00
10.0-10.9 4 0.0339 3 9 1.29 11.0-11.9 2 0.0260 3 9 1.80 12.0-12.9 4 0.0202 13.0-13.9 9 0.0153 o o 0.00 14.0-14.9 3 0.0120
*15 14 0.0351 7 49 7.00 N=200 1=80.51
0.01) = 26.22
80.51 > 26.22 Erlang does not fit at the 1% significance level.
11111 11111 111111 111111 MI MI MM MIN MB MI 11111 111111 Bal MM
TABLE D-25
CHI-SQUARE TEST T0 CHECK Tib GOODNESS OF FIT OF POISSON DISTRIBUTION .TO.OBSERVED DATA:
COMBINED THROUGH LANES - DIXON ROAD
CLASS INIRVAL
(SEC)
OBSERVED FREQUENCY
(fo)
PROBABILITY (POISSON)
THEORTICAL FREQUENCY
(CT) f -fT) (fo-fT)2 (fo-fT)2
fT
0.0-0.9 47 0.2673
HH
UT
t f N
.)
0 0
C\J H
cel
r-i (Y•N
C\J
36 0.68 1.0-1.9 59 0.1958 400 10.26 2.0-2.9 29 0.1435 0 0.00 3.0-3.9 15 0.1052 36 1.71 4.0-4.9 5.0-5.9 6.0-6.9
13 10
5_
0.0770 0.0565 0.0413
4 1 9
0.27 0.09 1.13
7.0-7.9 5' 0.0303 1 0.17 8.0-8.9 9 0.0222 9-.0-9.9 3 0.0163
10.0-10.9 2 17 0.0119 9 0.64 11.0-11.9 2 0.0087 12.0-12.9 0 0.0065 13.0-13.9 1 0.0046
N=200 Z=14.95
X2 = 16.01 (7,0.025)
14.95 Z.16.01 Poisson fits at the 2.5% significance level.
Mil MI 11•11 AMI Rial Ili MI MIN IMIII OMM MI MM MI Mil MI
OHI-SQUARE TO ,OH CKTHEG0NESS OF FIT OF EALA:Nèz;'-(e=2) - DIeTRIBLIZION,- Tbs..0§..mvi) DATA:
OblviBINED-_TIIRO:UGH LANE-à- - -DIXOÉ IIOAD . .
CLASS INTERVAL
(SEC)
OBSER-Vh?, 0 • FR 0ENCY E0 -. •
(fo)
PROBABILITY
(K=2)
`IUEORET:ILICAL FREcraZ CY
(fil.)1 fo-fT) (f -fT)2 (fo-fT)2
fT
0.0-0.9 47 0.1291 26 21 ) 011 16.96 1.0-1.9 59 -Ô.2214.2 45 114. 196 4.36 2.0-2.9 29 0.2033 41 12 1)14 3.51 3.0-3.9 15 0.1535 31 16 256 8.26 4.0-4.9 13 0.1°66 - 21 8 6LL 3.05 5.0-5.9 10 00697 14 4 ' 16 1.14 6.0-6.9 5 -0.0hh5 9 4 16 1.78 7.0-7.9 5 o.o279 6 1 1 0.17 8.0-3.9 9 - 0.0163 • 9.0-9.9 3 :0.0100
31 2
10.0-10.9 2 17 .3 -.0053 1 lo 100 14.29 11.0-11.9 , 2 00035 1 12.0-12.9 .. o O.0024 o 13.0-13.9 1 ' 0.0008 0
N=200 - r=53.52
.)ç,2 - (7 -0.01)
:ï3.52 >i8.48 Y Er1ang doe.s ribt fit at the,10/„signi_ficance level.
Bal MI MB MB MI MB MI MIN MI MI MB MB MB IMM ,—
TABLE D-27
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF POISSON DISTRIBUTION TO OBSERVED DATA:
COMBINED THROUGH LAIES - ISLINGTON AVE.
CLASS INTERVAL (SEC)
OBSERVED FREQUENGY
(fo)
PROBABILITY POISSON)
THEORETICAL FREQUENCY (f T)
- (fo-fT) (fo-fT)2 (fo-fT)2
fT
0.0-0.9 YI 0.3693 74- 30 900 12.16 1.0-1.9 75 0.2330 47 28 784 16.68 2.0-2.9 33 0.1469 29 4 16 o.55 3.0-3.9 18 0.0926 19 1 1 0.06
9 0.0582 12 3 9 0.75 5.0-5.9 9 0.0371 7 2 4 0.58 6.0-6.9 6 0.0233 5 1 1 0.20 7.0-7.9 1 0.0146 3 8.0-8.9 2 0.0092 2 9.0-9.9 2 6 0.0059 11 7 1 1 0.14
10.0-10.9 o 9.0036 1 11.0-11.9 1 0.0023 o
N=200 E =31.12
X2(6,0.01) = 16.81
31.12 >16.81 poisson does not fit at the 1% significance level.
IMIll MI MI 111311 MM MI MI Mil Mil Mal Mil IBM Mil
TABLE D-28
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF ERLANG (K=2) DISTRIBUTION TO OBSERVED -DATA:
COMBINED THROUGH LANES - ISLINGTON AVE.
CLASS INTERVAL
(SEC)
OBSERVED FREQUEMCY
(fo)
PROBABILITY (ERLANG)
(K=2)
THEORETICAL FREQUENCY
(fT) (fo-fT) f -fT)2 (fo-fT)2
fT
0.0-0.9 44 0.2356 47 3 9 0.19 1.0-1.9 75 0.3145 63 12 1244 2.29 2.0-2.9 33 0.2130 43 10 loo 2.33 3.0-3.9 18 0.1197 24 6 36 1.50 4.0-4.9 5.0-5.9
9 9
0.0617 0.0268
12 5
3 4
9 16
0.75 3.20
6.0-6.9 6 0.0168 3 7.0-7.9 1 0.0069 1 8.0-8.9 2
2 1 12 0.0031 1 5 7 9.80
9.0-9.9 0.0009 o 10.0-10.9 o 0.0006
. o
11.0-11.9 1 '0.0002 0 y=20.06 N=200
y2 " (5,0.01) = 18'48
20.06 >18.48 Erlang does not fit at the 1% significance level.
MM MI Mill IBM MI MM IBM MM Mil MI Mil Mil
TABLE D-29'
CHI-SQUARE TEST TO.CHECK THE GOODNESS OF FIT OF POISSON DISTRIBUTION TO OBSERVED DATA:-
COMBINED THROUGH LANES - DUFFERIN ST.
CLASS INTERVAL
(SEC)
OBSERVED FREQUIMCY
(fo)
PROBABILITY (POISSON)
THEORETI CAL FREQUENCY
(fT) (fo-fT) (fo-fT)2 (fo-fT)2
fT
0.0-0.9 61 0.5093 102 41 1681 16.48 1.0-1.9 87 0.2500 50 27 729 14.58 2.0-2.9 33 0.1226 25 8 64 2.56 3.0-3.9 14 0.0601 12 2 4 0.33 4.0-4.9 3 0.0296 6 3 9 1.50 5.0-5.9 1 0.01/01 3 6.0-6.9 2 0.0072 11 5 3 9 1.80 7.0-7.9 o 0.0035 1 8.0-8.9 1 0.0017 o
N=200 E =37.25
(4,0.01) = 13.28
37.25 713.28 Poisson does not fit at the 1% significance level.
UMM Mill IIIMI MI Mi MI Ilall MM MI MI MI Mil IBIS MM MM URI Mil
TABLE -D-30
CHI-SQUARE TEST TO CHECK THE GOGDNESS OF FIT OF _a(LANG (K=2) DISTRIBUTION TO OBSERVED DATA:
COMBINED THROUGH LANES - DUFYERIN ST.
CLASS INTERVAL (SEC)
OBSERVED FREQUENCY (fo)
PROBABILITY (ERLANG) (K=2)
THEORETICAL 10.a-EQUENCY
(fT) (fo-fT) (fo-fT)2 (fo-fT)2
fT 0.0-0.9 1.0-1.9 2.0-2.9 3.0-3.9 4.0-4.9 5.o-5.9 6.0-6.9 7.0-7.9 8.0-8.9
=
61 87 33 14 1 3 1 0 0 1
19
0.4165 0.3603 0.3494 0.0517 0.o156 o.0046 0.0014 0.0004 0.00006
83 72 30 10 3 1 0 114 0 0
22 15 3
5
484 225 9
25
5.83 3.13 0.30
1.78
N=200 z=11.04
X2(2,0,01) = 9.21
11.04 >9.21 Erlang does not fit at the 1% significance level.
Bal Mil MM IIIIIII MIN MI MM Mal MI MM IIIIIII MI MM MM MINI
TABLE .D-31
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF POISSON DISTRIBUTION TO OBSERVED DATA:
COkBINED THROUGH UNES - AVENUE ROAD
GLUS INTERVAL
(SEC)
OBSERVED FREQUENCY
(fo)
PROBABILITY (POISSON)
THEORETICAL FREQUINCY
(fT) (fo-fT) (fo-fT)2 (fo-fT)2
fg'
0.0-0.9 62 0.5195 104 42 1764 16.96 1.0-1.9 2.0-2.9
95 26
0.2497 0.1199
50 24
LL5 2
2025 4
40.50 0.16
3.0-3.9 9 0.0576 12 3 9 0.75 4.0-à.9 4 0.0277 6 2 4 0.67 5.0-5.9 2 0.0133 3 6.0-6.9 1)4 0.0064 1 5 1 1 0.20
7.0-7.9 1 0.0031 1 E=59.24 11=200
"A" ,2,0.01) 13.28 (4 59.24 > 13.28 Poisson does not fit t t e 1% significance level.
_
lia MN MM Mil MM IIIMI MI IIIIIII Mil Mil MI MM Mi MIN Mal INN
TABLE D-32
CHI-SQUARE TEST TO CHECK THE GOODNESS OF FIT OF ERLANG (K=2) DISTRIBUTION TO OBSERVE]) DATA:
COMBINED THROUGH LANES - AVENUE ROAD
CLASS INTERVAL
(SEC)
OBSLRVED FREQUI1NCY
(fo)
PROBABILITY (ERLANG)
(K=2)
THEORETICAL FREQUEN-CY
(fT) (fo-fT) (fo-fT)2 (f0-fT)2
fT 0.0-0.9 1.0-1.9 2.0-2.9 3.0-3.9 4.0-4.9 5.0-5.9 6.0-6.9 7.0-7.9
62 95 26
9 4 2 1 17 1 1
0.4308 0.3596 0.1432 0.0472 0.0134 0.0038 0.0015 0.0004
86 72 29
9 3 1 13 0 o
14 23
3
4
196 529
9
16
2.28 7.35 0.31
1.23
N=200 1=11.17
X(2,001) = 9.21
11.17 > 9.21 Erlang does not fit at:the 1% Significancé
157
REPERENCES
Bennett, C.A., ad Franklin, N.L., Statistical Analysis in Chemistry and the Chemical Industry; John 'Wiley and Sons, 1954.
Greenshields, B.D., and Weida, F.M.; Statistics with applications to Highway Traffic Analysis; the Eno Foundation for Highway. Traffic - Control, 1952,
Gerlough, D.L.; "The use of the Poisson Distribution in Highway Traffic", in Gerlough, D.L., and. Schuhl,. A., "Pesson and Traffic"; the Eno Foundation for Highway Traffic Gontrol, 1955,
Haight, F.A., Whisler, B.F., and Mosher, W.W.Jr.; A new statistical method for describing the distribution of cars on a road; Institute of Transportation and Traffic Engineering, University of California, Los Angeles.
. 5. Jensen, A.; "Traffic theory as am aid in the planning and operation of the Roaa Grid". Ingenitren No.2, vol. 1, 1957. (Danish Engineering Periodical).
Kendall, D.G.; Some problems in the Theory of Queues; Royal Statistical Journal, Series 13, Vol. 13, No.2, 1951.
Matson, T.M., Smith, U.S., and Hurd, F.W.; Traffic Engineering; McGraw-Hill, 1955.
Morse, P.M.; Queues, Inventories and Maintenance; Operation Research Society d' America, publication No.1; John Wiley and Sons, 1952.
. Pearson, K.; Tables for Statisticians and Biometricians; Biometric Laboratory, University College, London, part I, third edition, 1951. Smith, J.G., and Duncan, A.J.; Sampling Statistics and applications; McGraw-Hill, 1943.
Vardon, J.L.; "Some factors affecting mergIng traffic on the outer Ramp of Highway Inter changes"; A Master's degree thesis, Queen's University, July 1959.
Williams, K.M.; "Vehicle operating characteristics on outer loop deceleration lanes of interchanges"; A Master s degree thesis, University of Toronto, October 1960.
Wyse, J.M., "A study of Flow on Highway 401, an Technical Report of the 1960.
some characteristies of Traffic Urban Freeway"; Unpublished Ontario Department of Highways,
olmiliirjElsil[q