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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

Austroads developments in skid resistance

Kym Neaylon, ARRB

Dr Young Choi, ARRB


Outline
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?


Austroads
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


Austroads1
Austroads

Purpose

  • Provide expert advice

  • Facilitate collaboration

  • Promote harmonisation, consistency and uniformity

  • Undertake strategic research

  • Promote improved and consistent practices


Austroads2
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


Recent austroads skid publications
Recent Austroads skid publications

2005 Guidelines

2009 Skid resistance

2009 Texture

2011 Policy

All downloadable from www.austroads.com.au publications


2011 guide for development of policy
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




Review of measurement methods
Review of measurement methods

Literature review (in publication)

Factors

  • Slip ratio

  • Slip speed

  • Water film thickness

  • Test tyre

  • Temperature

  • Etc…..

  • Every device varies!


Review of measurement methods1
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


Review of measurement methods2
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


Review of measurement methods3
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


Psv test and pafv test
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)


Psv and pafv tests
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)


Reference stone for pafv test
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


The psv test and today s traffic
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?


Wehner schulze test
Wehner Schulze test?

Photos: K Neaylon


Micro deval with aggregate imaging
Micro-Deval with aggregate imaging?

Photos: Robert Myers Associates

Photos: Pine instruments


Ncat three wheel polisher with ctm
NCAT three wheel polisher with CTM?

Photo: NCAT

Photo: D Wilson



Conclusion partnerships in practice
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


For more information
For more information

Contact:

Kym Neaylon

National Technical Leader

Sustainable Infrastructure Science

ARRB Group

Melbourne, Australia

[email protected]

Telephone: +61 (3) 9881 1629

Mobile: +61 (4) 3043 7172


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