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Delegation from Indonesia. Drivers are not always the problem
Roadside Hazard Management.
May 31, 2012
Roadside Management Strategy
Strategic Issues.
Aims: To efficiently deliver programs in three key outcome
areas of;
Safety
Roadside Hazard Management
Environmental & Cutural Heritage Values.
Amenity and Access.
Roadside Hazard Management = RHM RHM
Roadside
The area outside the lane edgeline.
What is a Roadside Hazard ?
Any object or feature on or near the
roadway which is likely to create a
danger to the occupants of any
vehicle leaving the roadway
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RHM RHM
Strategy for Roadside Hazard Management
What is Roadside Hazard Management ?
1. Keep vehicles on the road
2. Provide a forgiving roadside
Identify, prioritise and treat roadside hazards in order to
Identify, prioritise and treat i. remove the hazard
roadside hazards in order to
maximise safety by reducing the incidence and/or severity of ii. relocate the hazard
such crashes. iii. alter to reduce severity
maximise safety by reducing the iv. protect using barriers / attenuators
incidence and/or severity of such
crashes.
RHM RHM
The approach to the Management of Roadside Hazards Elements of the Roadside.
differs between
 Shoulders
 Signs
New road projects and existing roads.
 Batters
 Clear zones
RHM RHM
Shoulder width. Shoulder width.
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RHM RHM
Shoulder/Lane width Shoulder width.
RHM RHM
Shoulder width - bridges. Poles
RHM RHM
Signs-lateral clearance. Guideposts
 Diagram from TMV2
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RHM RHM
Guideposts Batters
 Uphill batters.(cuttings).
RHM
Batters RHM
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.
RHM RHM
Driveable Endwalls Clear zone?
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RHM
Clear zone? RHM
What is a Clear Zone ?
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RHM RHM
Clear zone? Clear zone?
RHM
RHM Risk
What is a Clear Zone ?
The clear zone adopted depends on:
- vehicle speeds
- vehicle volumes
- road curvature
- embankment slope
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RHM RHM
Clear Zone Graph Clear zone adjustments
RHM RHM
Barriers
Clear zone?

Flexible Barriers
Semi-Rigid Barriers
Rigid Barriers
RHM
Brifen Wire Rope Fence
Flexfence
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RHM RHM
Flexible barrier. Flexible Barrier
Brifen Wire Rope Safety Barrier
RHM RHM
Flexible barrier – anchorage. Flexible barrier – cross median protection.
Flexfence Wire Rope Safety Barrier
RHM RHM
Motorcycles & wire rope barriers. Non conforming barrier.
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RHM RHM
Steel beam guard fence. Steel beam barrier.
At culvert.
Terminology.
W Beam Safety Barrier
RHM RHM
Steel beam barrier. Guardfence Terminal
RHM RHM
Interface with bridge. Barrier –Structure Interface
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RHM RHM
Crash cushion. Crash cushions.
RHM
Rigid barrier
RHM
Rigid Barrier
New Jersey Barrier Single slope Tric bloc
RHM Roadside Hazard Management.
Rigid Barriers.
New Roads
Possible to include treatments in design.
Effect on total project cost minimised.
Existing Roads
Implementation of all measures impractical.
Cost to implement all measures.
Best use of available money?
Need a method to identify sites or areas.
Need a method of prioritisation.
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RHM RHM
Crash Reduction Factors. Crash Reduction Factors.
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