Skid Resistance Management – Striving for that Optimum ...

Paul Hillier and John Donbavand

ARRB Group and NZTA

Skid Resistance Management – Striving for that Optimum Local Strategy

e

Typical incident scene?

Optimum Local Skid Resistance Strategy

The evidence is there……


northbound

Quick Quiz

Skid resistance management is the domain of national and state road agencies only?

True or False?

Skid resistance management involves annual testing over the whole of the network?

True of False?


Quick Quiz

Skid resistance management is the domain of national and state road agencies only?

True or False? False

Skid resistance management involves annual testing over the whole of the network?

True of False? False


Barriers to implementation?

• No statutory requirement • ‘True skid crashes very rare’ (more pressing needs) • Not for us (SRAs only, & not all SRAs are doing it) • Have to collect test data? • So much to do ….. too expensive, inc. vast & remote road

networks • Must be ‘all or nothing’? • Little knowledge or expertise • Many barriers still remain!


But, there’s so much we can do!


Most recent developments….


NZ Snapshot – Local Roads


Auckland Transport Skid Resistance Strategy Thanks to Gerri Waterkamp and Andy Finch • A strategy not a policy • SCRIM survey of most of the network • Grip Tester - Local Roads/Difficult Sites • Prioritisation process for treatment and site selection – applicable to different funding levels


Interventions


Look at all the factors: • Speed Environment • Crash History • Traffic Volume • Road Geometry • Pavement Defects

Only then prioritise and programme remedial work

AT to carry out a Trial


After the 15/16 Trial Survey AT intend to: Assess the SCRIM results asking… • Are the Investigatory Levels (ILs) correct for an Urban environment? • Are our Rural ILs correct? • How much of the network is below the IL? • How much will it cost to implement?

• Survey Costs • Mitigation / treatment Costs

• Is the strategy sustainable in the current environment?


Copies of the AT Skid Resistance Strategy are available

please contact [email protected]

Christchurch City Council Skid Resistance Policy

Thanks to Peter MacDonald

The purpose of the document is to define a skid resistance policy for Christchurch City Council.

This policy identifies practices and procedures adopted by Christchurch City Council that modify or enhance the requirements of NZTA T10:2012 Specification for Skid Resistance Management.


Examples of Changes to T10 by Christchurch CC

• Annual SCRIM survey will be limited to the arterial network • Reduced ILs for low speed environments. • Prioritise treatment based on nose to tail crashes at signalised intersections. • Local aggregate to be used except where there is justification for other high friction

surfacing. • Assessment of trends in SCRIM data must be taken into account where a section is below

the IL • Temporary ‘slippery surface’ signage shall be installed for any section below the IL when the

signed speed is >60kmph • Due to current network conditions SCRIM treatments will not be undertaken when the

current operating speed of the section is <50kmph.


SCRIM Surveys for Local Roads


Australian Snapshot – Local Roads


An element of truth?

f


Closing Remarks


What is needed in support? • Realisation were are not going to get there in 5 minutes • Renewed interest • Create a new momentum – national (Austroads) group re-established?

• Don’t discard what we have in place – review and improve • Grow and encourage new talent • Awareness / knowledge transfer • Active state road agencies to promote and mentor local government • ‘Sell’ - even a modest, fit-for-purpose local strategy makes a difference

• [A mandatory requirement?] • [A high profile incident / legal case?]


Thank you …


Skid Resistance Management – Striving for that Optimum ...

Documents

Transcript of Skid Resistance Management – Striving for that Optimum ...