TRAFFIC ACCIDENT ANALYSIS (seminar).pptx

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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NEED FOR STUDY

ANALYSIS

Collection

interpretation

MEASURES

New design

Rules

regulations

ENGG

productivity

Smart society

development


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TYPICAL

TYPES

AT INTERSCTION WITH STATIONARY

OBJECT

HEAD ON

WITH PARKEDVEHICLE


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PRE-REQUISITES

KINETIC ENERGY CONCEPTS

FRICTIONAL FORCE CONCEPTS

ENERGY THEORY

MOMENTUM THEORY

COEFFICIENT OF RESTITUTION


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Ratio of speed before and after animpact

An intrinsic property

For perfectly elastic collision, e=1

For inelastic collision , e


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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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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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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

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TRAFFIC ACCIDENT ANALYSIS (seminar).pptx