W.D.M. LimitedNorth View, Staple Hill, Bristol BS16 4NX

Telephone: 01179 567223 Web: www.wdm.co.uk

London wide skid policy

November 2009Martin Sachs, Mark Stephenson

• London-wide work by LoTAG HMSG• Skid Resistance Policy one of several London-

wide projects• Aims of project and project initiation• Overview of work carried out by WDM for roads

2000• London wide skid policy and guidance

documents• Overall benefits of policy• Deficiency listing and site investigation• Case studies

Presentation outline

• Highways Maintenance Steering Group set up in 1997

• Set up to bring “practitioner” voice to LoTAG Group 2

• Aims- to identify and encourage best practice in Highways Maintenance

• Federal structure- Steering Group made up of Sector Chairs

• Activist agenda- benchmarking, sharing solutions and joint projects

LoTAG Highways Maintenance Steering Group

• London-wide Asphalt Project• Trials Database• CDM Competences Training• Site Card• Winter Service• London-wide Skid Resistance Project

London-wide Projects

• To provide generic policy for use across London

• To develop consistent approach and draw on existing standards

• To focus (for now) on TLRN and principal roads• Project placed with WDM as extension to

Road2000 work• Project Board appointed by HMSG• Delivery- Generic policy and guidance emailed

out last Thursday!

Project Aims and Delivery

• Analysis of accidents and SCRIM data• Development and agreement of Initial

Investigatory Levels• Policy and Guidance documents• Training (March/ April 2009)• Production of deficiency listing and maps for

2008• In productions – deficiency listing for

2009• London wide site ranking?

WDM work on project

Skid policy and guidance documents

• Policy is template for adaption by boroughs

• Guidance document gives procedures to follow

• Issued as draft in April, final last week

• Together will assist in casualty reduction and risk management

• Guidance document gives overview of benefits at network level

• Can apply same principle to each borough• Is it correct to apply network wide assumptions

to individual site?• Adopt process similar to that used in local

safety schemes – first year rate of return (FYRR)

= cost of accident x no of accidents saved

cost of scheme

Policy benefits

Deficiency listing

• Combines accident and SCRIM data

• Is a tool to prioritise sites for investigation.

• 2009 deficiency listings to be provided that consider 2009 survey data, and 3 year accidents to April 2009

Case study 1: South London bend

V2 LOST CONTROL ON LEFT HAND BEND AND HIT V1 wet/damp 03/05/2005RIDER OF V1 LOST CONTROL AND HIT V2 wet/damp 28/09/2005V1 LOST CONTROL AND HIT V2 dry 15/05/2006V1 LOST CONTROL ON LEFT HAND BEND AND HIT V2 wet/damp 15/08/2007V1 HIT V2 AS IT CROSSED UNBROKEN WHITE LINES wet/damp 11/02/2005V1 LOST CONTROL FROST / ICE 04/01/2006V1 LOST CONTROL ON BEND dry 29/12/2006V1 SKIDDED AND HIT V2 wet/damp 19/11/2007

• Top ranked site in borough on deficiency listing

• Site is 0.12 deficient• 8 injury accidents, of which 5 in wet, all

involving loss of control• Investigation

– Surface condition– Geometry

• At initial level a surface treatment is likely to bring some accident savings and have good FYRR

Case study 1: South London bend

Case study 2: North London crossing and junction

• high ranked site in borough on deficiency listing.

• Classified as approach to crossing, but close to junction as well.

• Site is 0.13 deficient.• 19 injury accidents in 3 years, of which 6 in

wet. 4 pedestrian casualties.• A lot going on at the site – may

warrant wider review and additional treatment as well as surface.

Case study 2: North London crossing and junction

Case study 3: East London crossing

V1 approached controlled pelican crossing. Traffic light were flashing amber ready to go green. Injured pedestrian rain into the carriageway from the north footway on

• 15th ranked site in borough on deficiency listing

• Classified as approach to crossing• Site is 0.11 deficient• 1 serious injury accident in wet• Deficiency cause for concern• Lower priority to treat – but harder to make

the decision

Case study 3: East London crossing

• Included in guidance document• Suggests overall programme for survey,

production of deficiency listing and investigations

• Likelihood is that sites identified in year 1will be treated in year 3

• May need mechanism to fast track sites with high accidents rates/ high deficiency

Timeline

WDM can:• Produce 2010 deficiency listing• On site training in carrying out investigations• Review policy and guidance v new HD28• Assist in developing policy for other roads• Miscellaneous training for boroughs• Audit implementation of policy

Further work

• London-wide Skid Resistance Policy Project Board

• LBHF for project governance• TfL support• TRL• LB’s of Islington and Hammersmith and

Fulham for hosting meetings.

Thanks to

Questions