Surabaya 30th & 31th May 2012
Roadside hazard management
Phillip Jordan, Consultant
Road Safety International Pty Ltd
• Discuss the “clear zone” concept
• Discuss the 5 part strategy
• Look at some safety tips for roadside safety
In this presentation:
A “forgiving” road is one that:
- does all that is possible to keep the vehicles on the road
- has driveable side slopes, no drains nearby
- removes or relocates roadside hazards
- uses forgiving roadside furniture
- has crash barrier only where really needed
- is well maintained
You can improve safety by providing a forgiving road
Barriers should only be the last option – and if used they must be correctly
installed and maintained:
- located well off the road
- correct height, long enough to shield the hazard
- safe terminals (most terminals are not safe in Indonesia)
- good reflectors (for night time safety)
- well maintained
You can improve safety by installing crash barriers only where
really necessary
•Single vehicle run-off-road crashes are the single biggest
group of serious and fatal crashes on Indonesian toll roads
INDONESIAN HIGHWAYS?
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What is Roadside Hazard Management ?
R H M aims to “identify, prioritise and treat roadside hazards in order to maximise safety by reducing the
incidence and/or severity of such crashes.
What is a Clear Zone ?
A driveable roadside area that should be kept clear of hazardous objects in order to minimise the danger
of a collision should a vehicle leave the road.
X
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What is a Clear Zone ?
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Clear Zone Chart
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i. remove the hazard
ii. relocate the hazard
iii. alter to reduce severity
iv. protect using barriers/attenuators
1. Keep vehicles on the road
2. Provide a forgiving roadside
The 5 part strategy for Roadside Hazard Management
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- remove trees
- underground power lines
- maybe joint-use poles
Remove the Hazard
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Relocate the Hazard
Ideally to a location outside the clear zone, or at least relocate to a
less vulnerable position so that we reduce risk.
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- frangible lighting poles
- slip base
- impact absorbing
- frangible sign posts
- grade steep slopes (4:1 or flatter)
- driveable culverts
- cover drains
Alter the Hazard to Reduce
Impact Severity
More on these later............
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flexible (wire rope)
semi- rigid (W-beam guardrail)
rigid (concrete)
Also impact attenuators
Three types of crash barriers
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Crash barriers
Remember that safety barriers are roadside hazards – try
to design the new road to avoid having to use them
We can never be sure….
…. just where or when a vehicle will
leave a road.
We can never be sure….
…. just where or when a vehicle will
leave a road.
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i. remove the hazard
ii. relocate the hazard
iii. alter to reduce severity
iv. protect using barriers/attenuators
Culverts are dangerous
Can the road features, signing or delineation be improved to keep
vehicles on the road?
Can the hazard be removed to improve safety?
Are there steep slopes or other roadside hazards within the
Clear Zone?
Can the hazard be relocated to reduce the risk of it being hit?
Can the hazard be altered to reduce the severity of impact?
Can a safety barrier be installed to shield the hazard?
Determine the Clear Zone Distance
Improve the road features, signing or delineation to help
keep vehicles on the road?
Remove the hazard
No action is requiredMove the hazard beyond the
clear zone or to a safer location
Redesign or modify the hazard to reduce the severity of
impact?
Install an appropriate safety barrier to shield the hazard?
No
Yes
Yes
Yes
Yes
Yes
No
No
No
Yes
Forgiving sign supports
Forgiving sign supports
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Crash barriers ........
End treatments are necessary to avoid penetration into the vehicle