Austroads developments in skid resistance

Austroads developments in skid resistance

Kym Neaylon, ARRB

Dr Young Choi, ARRB

www.arrb.com.au Trusted advisor to road authorities for technical input and solutions2

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

Comprises

• All Australian state and territory road transport and traffic authorities

• Commonwealth department of infrastructure and transport

• Australian local government association

• NZ transport agency


Austroads

Purpose

• Provide expert advice

• Facilitate collaboration

• Promote harmonisation, consistency and uniformity

• Undertake strategic research

• Promote improved and consistent practices


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

www.arrb.com.au Trusted advisor to road authorities for technical input and solutions

Recent Austroads skid publications

• 2005 Guidelines

• 2009 Skid resistance

• 2009 Texture

• 2011 Policy

•All downloadable from www.austroads.com.au publications

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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

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Zones of regional similarity


Zones of regional similarity

Generic zone Minimum level of testing required

1 – low skid resistance demand

Process monitoring. (e.g. network laser texture surveys or visual analysis as minimum)

2 – medium skid resistance demand

Targeted testing. (e.g. portable and towed devices such as British Pendulum, GripTester, as a minimum)

3 – high skid resistance demand

Network Monitoring. (e.g. SCRIM where cost effective)

4 – High Density Urban (Brisbane, Sydney, Melbourne)

SCRIM, or GripTester for inaccessible sites


Review of measurement methods

Literature review (in publication)

Factors

• Slip ratio

• Slip speed

• Water film thickness

• Test tyre

• Temperature

• Etc…..

• Every device varies!

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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

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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

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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

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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)

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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

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Photo: AS 1141.41 – 1984 (superseded)

Photo: R. Yeo


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

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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?

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Wehner Schulze test?

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Photos: K Neaylon


Micro-Deval with aggregate imaging?

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Photos: Robert Myers Associates Photos: Pine instruments


NCAT three wheel polisher with CTM?

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Photo: NCAT Photo: D Wilson


Any other alternatives to PSV?

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?


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

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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

Documents

Austroads developments in skid resistance