Breaking the Silence on Road Surfaces and Accident Rates
This paper by R.A. Rallings discusses the importance of addressing road surfaces and their impact on accident rates. It highlights the distorted public understanding of road safety due to silence, emphasizing the need for reliable information and funding. The scope includes insights from the Tasmanian Select Committee on Road Safety, principles of Risk Management, and detailed data analysis. The ALARP Principle of Risk Management and Investigatory Levels in roadways are also explored, along with key recommendations from the Legislative Council's Committee on Road Safety.
Download Presentation
Please find below an Image/Link to download the presentation.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author. Download presentation by click this link. If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.
E N D
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 2 Committee received: 76 written submissions 83 oral presentations in 4 Australian states 3 Made 69 findings and 52 recommendations
Road Surfaces- Breaking the Silence ALARP Principle 1. Basic principle of Risk Management: Risks should always be set at : As Low As Reasonably Practical 2 It requires demonstration that: Sacrifice in reducing risks>> Benefits
Road Surfaces- Breaking the Silence *Site Categories -Investigatory Levels ILs Manoeuvre Free Roadways Site Category Grade % Horizontal Radius (m) IL SFC 2 => 5 or < 250m 0.50 4 (single) <5 >250m O.40 5 (dual) <5 >250m O.35 6 =< 100m 0.60 *Vicroads/ DMR (1995)
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 <0.30 to > 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 Category 6 Single 500 Wet Rd Accidents/108 vehicle km Category 5 Dual 50 Category 2 Single 20 Category 4 Single 5 0.30 0.325 0.375 0.425 0.475 0.525 0.575 0.625 0.675 0.70 SFC WDM ,RAR
Road Surfaces- Breaking the Silence Variation in Accident Rates in Cat 2 500 Grades > 5% Radii< 250m Wet Rd Accidents/108 v km Grades < 5% Radii < 250m Grades > 5% Radii > 250m 50 20 5 0.30 0.325 0.375 0.425 0.475 0.525 0.575 0.625 0.675 0.70 SFC (WDM, RAR)
Road Surfaces- Breaking the Silence AADT and SFC 3500 Site Category 4 3000 Site Category 2 2500 Average AADT Site Category 6 2000 1500 1000 500 0 0.30 0.325 0.375 0.425 0.475 0.525 0.575 0.625 0.675 0.70 SFC WDM, RAR
Road Surfaces- Breaking the Silence Distribution of Travel and Accidents Category 2 (b) single (Grades< 5%, radii < 250m) 30 Wet Rd Accidents 25 % of Accidents 20 Travel % of Travel 34% 15 10 5 0 0.30 0.325 0.375 0.425 0.475 0.525 0.575 0.625 0.675 0.70 SFC WDM, RAR
Road surfaces- Breaking the Silence SFC and Wet Rd Accidents/lane.km 100 Accidents (x10-2)/lane km/year Category 5 Dual Category 2 Single 10 Category 4 Single 1 0.30 0.325 0.375 0.425 0.475 0.525 0.575 0.625 0.675 0.70 SFC 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. 2 Breach of the ALARP principle? 3 Road authority, community, government?
Road surfaces- Breaking the Silence Engagement and Ownership of ILs Manages Network Road Authority Establishes Road Needs Information/Expertise ILs Carries risk Safe Environment Community Road Users Elected Government Pays taxes Allocated funds Votes Makes laws, regs
