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Cover of Road Safety Engineering Risk Assessment Part 6: Crash Reduction Rates
Road Safety Engineering Risk Assessment Part 6: Crash Reduction Rates
  • Publication no: AP-T151-10
  • ISBN: 978-1-921709-11-1
  • Published: 22 January 2010

ARRB Group has completed a major Austroads research program to assess risk involving road, traffic and roadside infrastructure. The results provide road authorities with more effective tools to reduce road crashes and injuries. The objectives for this part of the project were to improve crash reduction estimates associated with various road design features or safety measures (termed ‘issues’) in different environments, and to provide more objective analysis methods for use by road authorities in assessing relative risk. Consultation was undertaken with authorities in Australia and New Zealand to identify high priority issues for examination.

  • Road Safety Engineering Risk Assessment Part 6: Crash Reduction Factors
  • Austroads membership
  • 1. INTRODUCTION
  • 2. METHOD
    • 2.1. Issues for Investigation
    • 2.2. Review of Literature
    • 2.3. Procedure for Devising/Renewing Crash Reduction Estimates
  • 3. CRASH REDUCTION VALUES
  • 4. GAPS IN KNOWLEDGE
  • Accesses
  • Channelisation – splitter and median islands
  • Grade separation of intersections
  • Intersection – extend right-turn lane
  • Intersection – left-turn provision
  • Intersection – linked signals
  • Intersection – right-turn lane
  • Intersection – signal timing
  • Intersection – signal visibility
  • Line markings – profile edgelines
  • Medians
  • Median cross-overs
  • Midblock turning provisions
  • Off-road delineation – guide posts
  • Pavement markings – centreline
  • Pavement markings – edgeline
  • Pavement markings – speed limits
  • Pavement markings – words and symbols
  • Pedestrian crossings
  • Railway crossings
  • Safety barriers
  • Signs – advisory
  • Signs – regulatory
  • Staggered junctions
  • Street closure
  • Street lighting
  • Superelevation
  • Traffic calming
  • Traffic signals
  • Weather
  • 5. CONCLUSIONS AND RECOMMENDATIONS
  • Part 1: Crash risk and geometric design standards
  • Part 2: Crash risk migration
  • Part 3: Best practice in crash database design
  • Part 4: Treatment life for road safety measures
  • Part 5: Review of crashes on unsealed roads
  • Part 6: Crash reduction factors
  • Part 7: Crash rates databases
  • Part 8: Rural head-on crashes
  • Part 9: Rural intersection crashes
  • Part 10: Rural run-off-road crashes
  • Part 11: Road safety and maintenance
  • References assessed
  • Summary of research
  • Open road 4 lane
  • Open road 2 lane
  • Built up 4 lane
  • Built up 2 lane
  • References assessed
  • Summary of research
  • Splitter islands
  • Median islands
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • All locations
  • Signals
  • Not at signals
  • Rural
  • Urban
  • Painted
  • Physical
  • X- and T-intersections
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • Profile edge lining, edgeline (shoulder) rumblestrip, or shoulder grooving
  • Centreline rumblestrips (milled stripes adjacent to centreline marking)
  • Shoulder rumblestrips
  • Centreline rumblestrips
  • Transverse rumblestrips
  • References assessed
  • Summary of research
  • Built medians
  • Painted medians
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of Research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • Speed advisory signs
  • Curve warning sign
  • Chevron warning signs
  • Bridge warning signs
  • Animal warning sign
  • Advance direction signs
  • Variable message signs
  • Vehicle activated signs
  • References assessed
  • Summary of research
  • All regulatory intersection signs
  • Stop to give way sign
  • Stop sign
  • 4. way Stop
  • Give Way
  • Regulatory signs – non intersection
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research – decrease in speed limit (km/h)
  • Summary of research - increase in speed limit (km/h)
  • Change in mean speed and effect on safety
  • References assessed
  • Summary of research
  • References assessed
  • Street closure
  • References assessed
  • Summary of research
  • Summary table – all research
  • Improve lighting – all sites
  • New lighting – all sites
  • New lighting – intersections
  • New lighting – mid-block
  • New lighting – rural
  • New lighting – urban
  • New lighting – rural intersection
  • New lighting – urban intersection
  • References assessed
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
  • Summary of research
  • References assessed
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