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ONLINE TRAFFIC JAM MONITORING FOR MOBILE
USERSAssoc. Prof. Dr. Alexander V. Ivanov
Prof. Dr. Alexander Yu. Platov
Undergraduate Student Dmitry V. Stepanov
Nizhny Novgorod State University of Architecture and Civil Engineering,
Russia
NNSUACE
• New reality includes– Traffic congestion localities, described by average
“jam” velocity and the congestion size,
– Meteorological data including wind velocity and solar radiation,
– Calculated traffic flow parameters– Calculated air pollution (concentration of air pollutants
and noise)– Calculated short term and long term health risk.
NNSUACE Online Monitoring of Traffic Jam
Gaussian Model of Turbulent Diffusion
where:
C is the concentration of a pollutant in the air, mg/m3;
Q is the emission rate of the pollutant, mg/s
is the standard deviation of the Gaussian dispersion in the horizontal direction at x0, y0, z0; m;
is the standard deviation of the Gaussian dispersion in the vertical direction at x0, y0, z0; m;
U is the wind speed, m/s;
F is the background pollutant concentration, mg/m3.
h is the effective height of the source, m
x, y, z are the emission source coordinates, m;
NNSUACE
.2
,2 22
U
xK
U
xKz
zy
y == σσ
Gaussian Model of Turbulent DiffusionNNSUACE
Gaussian Model of Turbulent DiffusionNNSUACE
Atmosphere Boundary layer stability NNSUACE
Wind Velocity, m/s
Classes of sustainability A-F
Day timeSolar radiation
Night time. Clouds
Strong Convection
Moderate Convection
Slight Convection
>50% <50%
<2 A (A+B)/2 B E F
2-3 (A+B)/2 B C E F
3-5 B (B+C)/2 C D E
5-6 C (C+D)/2 D D D
>6 C D D D D
Pasquill stability categories
Online MeteoData Including Wind Velocity and Solar Radiation http://www.realmeteo.ru/
Meteorological Data is basic info for turbulent diffusion calculation
Moscow Never SleepsNNSUACE
Measured Share of Cars, Buses, Lorries and TrucksNNSUACE
Every Congestion Has Unic PortraitNNSUACE
User – Server Interaction Procedure NNSUACE
NNSUACE Online Flow Velocity http://www.yandex.ru/maps/47/
Internet address:https://yandex.ru/maps/47/nizhny-novgorod/?ll=44.005986%2C56.332609&z=11&l=map%2Ctrf%2Ctrfe&source=traffic
Interactive User-Server AlgorithmNNSUACE
Internet Service for Mobile Users Eco-routes NNSUACE
Avalable at http://eco-routes.appspot.com/
Web-Service Application Form
Start point and destination point
Start calculation
Calculated Concentration 1 of NOx
Calculated concentration 2 of Nox NNSUACE
Short Term Health Risk AssessmentNNSUACE
Short term risk assessment follows the methodology developed by A.V. Kiselyov and L.A. Savvateeva :
The 1st class of hazard: Prob = -9.15 + 11.66 * lg (С/MAC sh.t.),
The 2nd class of hazard: Prob = -5.51 + 7.49 * lg (С/ MAC sh.t.),
The 3rd class of hazard: Prob = -2.35 + 3.73 * lg (С/ MAC sh.t.),
The 4th class of hazard: Prob = -1.41 + 2.33 * lg (С/ MAC sh.t.).
Long Term Toxic Risk Assessment
Risk = 1 – exp{ln(0,84) [C/(MAC*Кз)] b t} ,
С – daily average concentration; MAC – max. allow. concentration; Кз - coefficient of safety is equal to 7,5 для 1st class of
hazard, 6 – for 2th class, 4,5 - for 3th class and 3,0 - for 4th class of hazard;
b – isoeffectiveness coefficient is equal to 2,4 for 1 class, 1,31 - for 2 class, 1,0 - for 3 class and 0,86 for 4class of hazard;
t – term of exposition; t = 1 for 70 years.
NNSUACE
Long Term Toxicological Health risk
• To calculate the pollution indicators, the user must click "Rate risk". As a result, the user sees ancategorized level of the Risk.
• The calculated level has Three categories
• 1. Favored2. Satisfactory3. Danger
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Conclusion 1Both short term and long term health risk estimations are important
online services for mobile users especially during traffic congestion.
Rather simple formulas are used to make instant estimation.
Traffic intensity and flow rate are the basic parameters for emission of pollutants.
Calculation of flow rate during traffic congestion is a very popular internet service provided by feveral private companies.
Several certified companies provide online meteorological services.
Key assumption for the calculations is that the measurement of the flow rate during traffic jam enables calculating traffic intensity.
The above mentioned assumptions and services give hope to spread online health risk assessment for the whole country.
NNSUACE
Conclusion 2
The weak point of the online monitoring is the lack of comparison with observations.
The service needs more detailed information about roads and vehicles. Number of lanes, traffic lights and age of vehicles are important for the accurate calculation.
Adaptation of the calculation for local circumstances will be a further task.
NNSUACE
Thank You Thank You for Your Kind Attentionfor Your Kind Attention!!
NNSUACE
Alexander Ivanov,Alexander Ivanov,[email protected]@gmail.com