Breaking the Silence About Road Surfaces and Accident Rates By R A Rallings, ME, FIE(Aust) CP Eng.

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Presentation transcript:

Breaking the Silence About Road Surfaces and Accident Rates By R A Rallings, ME, FIE(Aust) CP Eng

Road Surfaces- Breaking the Silence Reasons for Paper 1.The silence distorts the public’s understanding of road safety. 2. Public’s right for reliable information. 3. Silence will not attract needed funds. 4. Opportunity to pose questions.

Road Surfaces- Breaking the Silence Scope of Paper 1.Tasmanian Select Committee on Road Safety. 2.Principles and tools of Risk Management. 3.WDM’s review of ILs for SFC in Tasmania. 4. Additional analysis of WDM’s data. 5.Engagement and ownership of ILs.

Road Surfaces- Breaking the Silence Legislative Council’s Committee on Road Safety 1.Seven (7) Terms of Reference Road surface properties relevant to 3 terms 2Committee received: 76 written submissions 83 oral presentations in 4 Australian states 3Made 69 findings and 52 recommendations

Road Surfaces- Breaking the Silence ALARP Principle 1.Basic principle of Risk Management: “ Risks should always be set at”: A s L ow A s R easonably P ractical 2It requires demonstration that: Sacrifice in reducing risks>> Benefits

Road Surfaces- Breaking the Silence * Site Categories -Investigatory Levels ILs Site Category Grade %Horizontal Radius (m) IL SFC 2 => 5 or < 250m (single) <5 >250m O.40 5 (dual) <5 >250m O.35 6 =< 100m 0.60 *Vicroads/ DMR (1995) Manoeuvre Free Roadways

Road Surfaces- Breaking the Silence WDM’s Report

Road Surfaces- Breaking the Silence WDM’s data- Tas Road Network 6300 lane km (100m sections) 2145 Wet road accidents (2003 to 2006) 6 site categories (single and dual) 3 sub categories in Cat2 Average Annual Daily Traffic (AADT) 10 SFC bands/bins from 0.70 WDM/RAR

Road Surfaces- Breaking the Silence WDM, Site Category 4 - Equal Risk Policy WDM

Road surfaces- Breaking the Silence Ils derived from Equal Risk Policy WDM,RAR

Road Surfaces- Breaking the Silence Variation in Accident Rates in Cat 2

Road Surfaces- Breaking the Silence AADT and SFC WDM, RAR

Road Surfaces- Breaking the Silence Distribution of Travel and Accidents 34% (Grades< 5%, radii < 250m) WDM, RAR

Road surfaces- Breaking the Silence SFC and Wet Rd Accidents/lane.km WDM, RAR

Road Surfaces- Breaking the Silence Safety Policy Questions 1.Should the goals in setting ILs be to: Provide equal risk to all road users, or To minimise the number of accidents within the road network. 2Breach of the ALARP principle? 3Road authority, community, government?

Road surfaces- Breaking the Silence Engagement and Ownership of ILs Manages Network Establishes Road Needs Information/Expertise Safe Environment Allocated funds Makes laws, regs Carries risk Pays taxes Votes Road Authority Elected Government Community Road Users ILs