Roadside hazard management john coles

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  • 1. 2/06/2012Delegation from Indonesia. Drivers are not always the problemRoadside Hazard Management.May 31, 2012Roadside Management StrategyStrategic 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 1
  • 2. 2/06/2012RHM RHM Strategy for Roadside Hazard ManagementWhat is Roadside Hazard Management ? 1. Keep vehicles on the road 2. Provide a forgiving roadsideIdentify, prioritise and treat roadside hazards in order to Identify, prioritise and treat i. remove the hazard roadside hazards in order tomaximise safety by reducing the incidence and/or severity of ii. relocate the hazardsuch 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 zonesRHM RHMShoulder width. Shoulder width. 2
  • 3. 2/06/2012RHM RHMShoulder/Lane width Shoulder width.RHM RHMShoulder width - bridges. PolesRHM RHMSigns-lateral clearance. Guideposts Diagram from TMV2 3
  • 4. 2/06/2012RHM RHMGuideposts Batters  Uphill batters.(cuttings).RHMBatters 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 RHMDriveable Endwalls Clear zone? 4
  • 5. 2/06/2012 RHM Clear zone? RHM What is a Clear Zone ? }? RHM RHM Clear zone? Clear zone? RHMRHM RiskWhat is a Clear Zone ?The clear zone adopted depends on: - vehicle speeds - vehicle volumes - road curvature - embankment slope 5
  • 6. 2/06/2012RHM RHMClear Zone Graph Clear zone adjustmentsRHM RHM BarriersClear zone?  Flexible Barriers Semi-Rigid Barriers Rigid BarriersRHM Brifen Wire Rope FenceFlexfence 6
  • 7. 2/06/2012RHM RHMFlexible barrier. Flexible Barrier Brifen Wire Rope Safety BarrierRHM RHMFlexible barrier – anchorage. Flexible barrier – cross median protection. Flexfence Wire Rope Safety BarrierRHM RHMMotorcycles & wire rope barriers. Non conforming barrier. 7
  • 8. 2/06/2012RHM RHMSteel beam guard fence. Steel beam barrier. At culvert.Terminology. W Beam Safety BarrierRHM RHMSteel beam barrier. Guardfence TerminalRHM RHMInterface with bridge. Barrier –Structure Interface 8
  • 9. 2/06/2012 RHM RHM Crash cushion. Crash cushions. RHM Rigid barrierRHMRigid BarrierNew 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. 9
  • 10. 2/06/2012RHM RHMCrash Reduction Factors. Crash Reduction Factors. 10