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8/10/2019 TRAFFIC ACCIDENT ANALYSIS (seminar).pptx
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TRAFFIC ACCIDENTANALYSIS
( a scientific approach)
Muhammed Hassan Faisal
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traffic accident analysis
Howmanylives?
Howmuch
money?
Howmuch
resources
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traffic accident analysis
NEED FOR STUDY
ANALYSIS
Collection
interpretation
MEASURES
New design
Rules
regulations
ENGG
productivity
Smart society
development
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traffic accident analysis
TYPICAL
TYPES
AT INTERSCTION WITH STATIONARY
OBJECT
HEAD ON
WITH PARKEDVEHICLE
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traffic accident analysis
PRE-REQUISITES
KINETIC ENERGY CONCEPTS
FRICTIONAL FORCE CONCEPTS
ENERGY THEORY
MOMENTUM THEORY
COEFFICIENT OF RESTITUTION
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traffic accident analysis
Ratio of speed before and after animpact
An intrinsic property
For perfectly elastic collision, e=1
For inelastic collision , e
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traffic accident analysis
If skid marks are present, skid distances are measured to find actual braking
distances assuming 100% skid has occurred
When skid marks are not present , collision is assumed as free collision
For perfectly plastic bodies, after collision both would move together with
same speed v such that11 + 22 = 1 + 2
For perfectly elastic bodies, the coefficient of restitution will be unity and hence
b = (vb va)
in case there have coefficient of restitution (e)
b = (vb va)
Impact of vehicle may be either direct or oblique, at a known angle
Coefficient of friction may be either determined from tests or suitably
assumed.it is uniform throughout the skid
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COLLISION OF MOVING
VEHICLE WITH PARKED
VEHICLE
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traffic accident analysis
A vehicle of weight 2 ton skids through a distance equal to 40 mbefore colliding with another parked vehicle of weight 1 ton .
After collision both the vehicles skid through a distance equal to
12 m
Before stopping.
Compute the initial speed of moving vehicle . Assume coefficient
Of friction as 0.5
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CASE 2
TWO VEHICLES APPROACHING
FROM RIGHT ANGLES COLLIDE
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traffic accident analysis
QUESTION
Two vehicles A and B approaching at right angles , A from West
And B from South, collide each other . After the collision, vehicle A
Skids in a direction 50 degree North of West and vehicle B ,60 degree
East of North . The initial skid distances of the vehicles A and B are
38m And 20 m respectively before collision . The skid distances after
collision Are 15 m and 36 m respectively . If the weights of vehicles A
and B are 6.0 and 4.4 tons , calculate the original speed of vehicles . Theaverage skid resistance of the pavement is found to be 0.55
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Thankyou