Accident Investigation & Counter Measures.ppt

8/9/2019 Accident Investigation & Counter Measures.ppt

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Prepared by:

Road Safety & Planning Unit

Trac Safety DepartmentPLUS Expressways er!ad


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Human Factors

Road Environment

Factors

Vehicle Factors

The Three Contributing Factors To Road Accidents

(28%)

(8%)

(95%)

(67%)

(24%)

(4%)

(4%)

(4%)

Source : Austroads


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Programs ! "m#roving Road $a!et% Along

&orth $outh E'#ress(a%s

1. Accident Prevention Programs

2. Accident Reduction Programs

Road $a!et% Audit

High(a% #erations ) *aintenance +#grading ,or-s $a!et% Cam#aigns

Accident Prone Area /lac- s#ot0 "denti!ication Accident "nvestigation ) Counter *easures


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Accident Reduction Programs

Accident ata Collection

"denti!ication ) Prioritiation

o! Accident Prone Areas

"nvestigation ) $ite $tudies

Anal%sis ) Counter *easures

Evaluation


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Accident ata Collection


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"denti!ication ) Prioritiation

o! Accident Prone Areas


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ocation o! Accident Prone Areas

"n 4ear 2556


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"nvestigation ) $ite $tudies

b7ective

Ho( to Find Root Cause8

To !ind the root cause o! the occurrence o! accident at

the #articular location

Accident ata Anal%sis Collision iagram $ite "ns#ection


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Accident ata Anal%sis


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Collision iagram


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Collision iagram


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$ite "ns#ection

,hat To oo- For n $ite8

High(a% Alignment 9 straight: curve etc Cross!all camber0 and $u#erelevation

Pavement Conditions &os. ) ,idth o! anes (including emergency lane) $a!et% /arriers 9 shoulder ) median Clear ;one Road *ar-ings

$ignages 9 regulator%: (arning: directional signs ighting $%stems rainage $%stems Emban-ment: Verge ) Cut $lo#e

+se $ite "ns#ection Chec-list


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Additional "n!ormation

< Tra!!ic Flo( bservation

- ocal "n!ormation- Accident ,itness = Victim "n!ormation

Additional "n!ormation To /e Collected


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High(a% Alignment


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Cross!all ) $u#erelevation


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Pavement Condition

othole !leedin"

Ruttin" Ravelin"


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&os. ) ,idth o! anes

*idth o+ slo lane

*idth o+emer"enc, lane


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$a!et% /arriers


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Clear ;one

Edge ofpavement

Distance of trees from pavement edge more than 9 m


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Clear ;one

Edge of

pavement

Distance of trees from pavement edge less than 9 m


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Road *ar-ing Condition


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High(a% $ignages


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ighting $%stem


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rainage $%stem


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$lo#e ) Emban-ment


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High(a% $houlder = Verge


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$ite "ns#ection Chec-list


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$ite "ns#ection Chec-list


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"tem to "ns#ect /ased on T%#e o! Accident

T%#e o! Accident > Rear End Collision

"tem to "ns#ect >

Lane balancing Adequacy of Sight Distance (i.e. vertical & horiontal !rofile) "f during #et #eather$ chec% !avement condition (i.e s%id resistance &

de!ression) & drainage system

"f at signalied unction$ chec% the sto!!ing sight distance$ timing !hasing &

adequacy of signs 'ther !ossible items subect to site condition


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T%#e o! Accident > Head

idth of center median *y!e of safety barrier on the median Strength of safety barrier on the median +om!liance of safety barrier to design s!ecification

'ther !ossible items - subect to site condition


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T%#e o! Accident > $ide

Lane balancing eliminate any tra! lane situation "f during #et #eather$ chec% !avement condition (i.e s%id resistance &

de!ression) & drainage system "f at signalied unction$ chec% the sto!!ing sight distance$ timing !hasing &

adequacy of signs Adequacy of au,iliary lanes (acceleration & deceleration lanes) "f a!!roach to intersection interchange$ chec% adequacy of signages$ sie &

!osition of signages (legibility of sign) 'ther !ossible items subect to site condition


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T%#e o! Accident > Hit Roadside b7ect

"tem to "ns#ect >

+hec% the clear one !rovided emove any obect located #ithin clear one "f can/t be relocated$ !rovide !rotection of it #ith a!!ro!riate barriers "f there is a high accident at night time$ chec% the lighting system

'ther !ossible items subect to site condition


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T%#e o! Accident > ut o! Control

"tem to "ns#ect >

0avement condition "f at curve$ chec% the adequacy of su!erelevation$ crossfall Sight Distance (i.e. vertical & horiontal !rofile) "f during #et #eather$ chec% !avement condition (i.e s%id resistance &

de!ression) & drainage system 1erge condition Adequacy of delineation signs "f there is a high accident at night time$ chec% the adequacy of delineation

features and lighting system (if any) +hec% surrounding area$ any !ossibility of #ind crossing

'ther !ossible items subect to site condition


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Additional "n!ormation on Engineering

As#ect to "ns#ect

Ca#acit% o! the high(a% alignment #erational s#eed at the accident location

,eaving length *erging length Pavement Condition Assessment result

esign $#eed o! the alignment

$tud% Case At @m 2B &orthbound0 $ection &


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High(a% Alignment ? do#n hill #ith -23 gradient & 4S/ curve

Cross!all camber0 and $u#erelevation ?sufficient & acce!table Pavement Conditions ? As!halt at curve #ith good condition &os. ) ,idth o! anes ? 5.6m dual lanes #ithoutemergency lane $a!et% /arriers 9 shoulder 7 guardrail & median 7 concrete 89: Clear ;one ? not a!!licable Road *ar-ings ? good condition

$ignages ? insufficient #arning sign $#eed imit ? ;< %mhr #erating $#eed ? =>2 %mhr


T%#e o! Accident ccurred > oss Control: Rear End ) Hit uardrails

Finding o! "nvestigation >


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Proposed curve widening as recovery area for errant vehicle and construction of concrete

NJB to prevent errant vehicle from fall to the ravine


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THANK YOU

Accident Investigation & Counter Measures.ppt

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