2. In this presentation:
• Discuss the “clear zone” concept
• Discuss the 5 part strategy
• Look at some safety tips for roadside safety
3. You can improve safety by providing a forgiving road
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
4. You can improve safety by installing crash barriers only where
really necessary
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
5. •Single vehicle run-off-road crashes are the single biggest
group of serious and fatal crashes on Indonesian toll roads
INDONESIAN HIGHWAYS?
6. 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.
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7.
8.
9. 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
12. The 5 part strategy for Roadside
Hazard Management
1. Keep vehicles on the road
2. Provide a forgiving roadside
i. remove the hazard
ii. relocate the hazard
iii. alter to reduce severity
iv. protect using barriers/attenuators
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13. Remove the Hazard
- remove trees
- underground power lines
- maybe joint-use poles
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14. 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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15. Alter the Hazard to Reduce
Impact Severity
- frangible lighting poles
- slip base
- impact absorbing
- frangible sign posts
- grade steep slopes (4:1 or flatter)
- driveable culverts
- cover drains
More on these later............
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16. Three types of crash barriers
flexible (wire rope)
semi- rigid (W-beam guardrail)
rigid (concrete)
Also impact attenuators
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17. Crash barriers
Remember that safety barriers are roadside hazards – try
to design the new road to avoid having to use them
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18. We can never be sure….
…. just where or when a vehicle will
leave a road.
19. We can never be sure….
…. just where or when a vehicle will
leave a road.
20. i. remove the hazard
ii. relocate the hazard
iii. alter to reduce severity
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iv. protect using barriers/attenuators
35. Determine the Clear Zone
Distance
Can the road features, signing or Improve the road features,
Yes
delineation be improved to keep signing or delineation to help
vehicles on the road? keep vehicles on the road?
Are there steep slopes or other Yes
roadside hazards within the
Clear Zone?
Can the hazard be removed to Yes
Remove the hazard
No improve safety?
No
No action is required
Can the hazard be relocated to Yes Move the hazard beyond the
reduce the risk of it being hit? clear zone or to a safer location
No
Yes Redesign or modify the hazard
Can the hazard be altered to
to reduce the severity of
reduce the severity of impact?
impact?
No
Can a safety barrier be installed Yes Install an appropriate safety
to shield the hazard? barrier to shield the hazard?
