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Austroads developments in skid resistance

Austroads developments in skid resistance. Kym Neaylon, ARRB Dr Young Choi, ARRB. Outline. Introduce Austroads 3 Austroads projects 1. New policy guidelines for the management of skid resistance 2. Review of measurement methods 3. Reference stone for the Australian PAFV test

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Austroads developments in skid resistance

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  1. Austroads developments in skid resistance Kym Neaylon, ARRB Dr Young Choi, ARRB

  2. Outline • Introduce Austroads • 3 Austroads projects • 1. New policy guidelines for the management of skid resistance • 2. Review of measurement methods • 3. Reference stone for the Australian PAFV test • The PAFV/PSV test and today's traffic?

  3. Austroads Comprises • All Australian state and territory road transport and traffic authorities • Commonwealth department of infrastructure and transport • Australian local government association • NZ transport agency

  4. Austroads Purpose • Provide expert advice • Facilitate collaboration • Promote harmonisation, consistency and uniformity • Undertake strategic research • Promote improved and consistent practices

  5. Austroads Typical process for research work • Various committees identify research needs • Project scoped and approved • Workshop held for stakeholder views • Project group established - nominations from each state • ARRB undertakes research with input from the project group

  6. Recent Austroads skid publications 2005 Guidelines 2009 Skid resistance 2009 Texture 2011 Policy All downloadable from www.austroads.com.au publications

  7. 2011 Guide for development of policy Skid monitoring programs and investigatory limits • Are based on UK systems • Australian climate, traffic intensity, road network different • A single approach does not fit all Australia ‘Zones of Regional similarities’ developed • Rainfall • Population • Topography • Traffic • Climate

  8. Zones of regional similarity

  9. Zones of regional similarity 9

  10. Review of measurement methods Literature review (in publication) Factors • Slip ratio • Slip speed • Water film thickness • Test tyre • Temperature • Etc….. • Every device varies!

  11. Review of measurement methods Correlation and harmonisation exercises • Australian & New Zealand, 2000, 2003, 2005 • PIARC in 1990s • 47 measurement devices • 16 countries • 67 parameters • IFI • HERMES in 2000s • 15 measurement devices • 5 countries • EFI

  12. Review of measurement methods Correlation and harmonisation exercises cont. • TYROSAFE in 2007 • European consortium • Reviewed previous projects • Concluded there is no scale or system that can harmonise • Standardisation is the ultimate degree of harmonisation

  13. Review of measurement methods What now for Australia? • Harmonisation trials abandoned • Jurisdictions to carefully choose their testing device • Then retain its use over a long period of time • Different testing devices are appropriate for different zones • Monitored calibration exercises for all • SCRIMs • GripTesters • British pendulum testers

  14. PSV test and PAFV test • Quirky Australian history of 1960s ( see Appendix A of Austroads (2011) Guidance for the Development of Policy to Manage Skid Resistance)

  15. PSV and PAFV tests • Australian PAFV test ≈ rest of world’s PSV test • British stone, grit and tyres were to expensive to procure in Aust • PAFV developed mid 1970s as a surrogate for PSV • Different reference stone, grit and tyres → PAFV • Designed to closely replicate PSV • Most states use vertical wheel • One state uses a horizontal bed Photo: R. Yeo Photo: AS 1141.41 – 1984 (superseded)

  16. Reference stone for PAFV test • Australian PAFV test ≈ rest of world’s PSV test • Not only a different test, but also a different reference stone. • Stockpiles of reference stone developed 30 years ago are now depleted • Austroads has decided to re-adopt the UK reference stone. • PAFV/PSV test still has a number of years remaining • Austroads running proficiency studies, correlation, etc

  17. The PSV test and today's traffic • PSV test developed about 65 years ago • Questions: • Different traffic stresses now? • Many questions on relationship with road on-site performance! • Relationship to crashes? • Alternatives?

  18. Wehner Schulze test? Photos: K Neaylon

  19. Micro-Deval with aggregate imaging? Photos: Robert Myers Associates Photos: Pine instruments

  20. NCAT three wheel polisher with CTM? Photo: NCAT Photo: D Wilson

  21. Any other alternatives to PSV? ?

  22. Conclusion: “partnerships in practice” • Skid resistance in Australia relies on partnerships • Stakeholders • Jurisdictions • Working groups are used extensively • Draw on world wide activities • Australia believes it has a variety of local conditions • International solutions adapted, before they are adopted. • Australia needs to participate within the international community

  23. For more information Contact: Kym Neaylon National Technical Leader Sustainable Infrastructure Science ARRB Group Melbourne, Australia Kym.neaylon@arrb.com.au Telephone: +61 (3) 9881 1629 Mobile: +61 (4) 3043 7172

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