Skidding resistance of trunk roads

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Data description ( of 3 selected3 selectable options)

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Financial year ( of 26 selected26 selectable options)

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Road classification ( of 2 selected2 selectable options)

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Skid resistance ( of 4 selected4 selectable options)

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Data valuesData descriptionFinancial yearRoad classificationSkid resistance
3,192Kilometres2024-25Trunk roadLength of network
3,001Kilometres2024-25Trunk roadLength surveyed
328Kilometres2024-25MotorwayLength of network
326Kilometres2024-25MotorwayLength surveyed
3,189Kilometres2023-24Trunk roadLength of network
3,044Kilometres2023-24Trunk roadLength surveyed
328Kilometres2023-24MotorwayLength of network
328Kilometres2023-24MotorwayLength surveyed
3,219Kilometres2022-23Trunk roadLength of network
3,024Kilometres2022-23Trunk roadLength surveyed
328Kilometres2022-23MotorwayLength of network
328Kilometres2022-23MotorwayLength surveyed
3,219Kilometres2021-22Trunk roadLength of network
3,033Kilometres2021-22Trunk roadLength surveyed
328Kilometres2021-22MotorwayLength of network
327Kilometres2021-22MotorwayLength surveyed
3,227Kilometres2020-21Trunk roadLength of network
3,050Kilometres2020-21Trunk roadLength surveyed
328Kilometres2020-21MotorwayLength of network
328Kilometres2020-21MotorwayLength surveyed
3,227Kilometres2019-20Trunk roadLength of network
3,044Kilometres2019-20Trunk roadLength surveyed
328Kilometres2019-20MotorwayLength of network
326Kilometres2019-20MotorwayLength surveyed
3,227Kilometres2018-19Trunk roadLength of network
3,056Kilometres2018-19Trunk roadLength surveyed
327Kilometres2018-19MotorwayLength of network
327Kilometres2018-19MotorwayLength surveyed
3,229Kilometres2017-18Trunk roadLength of network
3,063Kilometres2017-18Trunk roadLength surveyed
327Kilometres2017-18MotorwayLength of network
327Kilometres2017-18MotorwayLength surveyed
3,229Kilometres2016-17Trunk roadLength of network
3,044Kilometres2016-17Trunk roadLength surveyed
327Kilometres2016-17MotorwayLength of network
326Kilometres2016-17MotorwayLength surveyed
3,261Kilometres2015-16Trunk roadLength of network
3,071Kilometres2015-16Trunk roadLength surveyed
327Kilometres2015-16MotorwayLength of network
326Kilometres2015-16MotorwayLength surveyed
3,243Kilometres2014-15Trunk roadLength of network
3,193Kilometres2014-15Trunk roadLength surveyed
327Kilometres2014-15MotorwayLength of network
327Kilometres2014-15MotorwayLength surveyed
3,218Kilometres2013-14Trunk roadLength of network
3,141Kilometres2013-14Trunk roadLength surveyed
395Kilometres2013-14MotorwayLength of network
327Kilometres2013-14MotorwayLength surveyed
3,218Kilometres2012-13Trunk roadLength of network
3,035Kilometres2012-13Trunk roadLength surveyed
395Kilometres2012-13MotorwayLength of network
318Kilometres2012-13MotorwayLength surveyed
3,160Kilometres2011-12Trunk roadLength of network
2,934Kilometres2011-12Trunk roadLength surveyed
391Kilometres2011-12MotorwayLength of network
302Kilometres2011-12MotorwayLength surveyed
3,108Kilometres2010-11Trunk roadLength of network
3,108Kilometres2010-11Trunk roadLength surveyed
361Kilometres2010-11MotorwayLength of network
279Kilometres2010-11MotorwayLength surveyed
-999 [x]Kilometres2009-10Trunk roadLength of network
-999 [x]Kilometres2009-10Trunk roadLength surveyed
-999 [x]Kilometres2009-10MotorwayLength of network
-999 [x]Kilometres2009-10MotorwayLength surveyed
3,104Kilometres2008-09Trunk roadLength of network
2,972Kilometres2008-09Trunk roadLength surveyed
364Kilometres2008-09MotorwayLength of network
311Kilometres2008-09MotorwayLength surveyed
3,104Kilometres2007-08Trunk roadLength of network
2,945Kilometres2007-08Trunk roadLength surveyed
364Kilometres2007-08MotorwayLength of network
313Kilometres2007-08MotorwayLength surveyed
3,071Kilometres2006-07Trunk roadLength of network
2,865Kilometres2006-07Trunk roadLength surveyed
325Kilometres2006-07MotorwayLength of network
325Kilometres2006-07MotorwayLength surveyed
3,071Kilometres2005-06Trunk roadLength of network
2,979Kilometres2005-06Trunk roadLength surveyed
325Kilometres2005-06MotorwayLength of network
325Kilometres2005-06MotorwayLength surveyed
3,071Kilometres2004-05Trunk roadLength of network
2,979Kilometres2004-05Trunk roadLength surveyed
325Kilometres2004-05MotorwayLength of network
325Kilometres2004-05MotorwayLength surveyed
3,071Kilometres2003-04Trunk roadLength of network
2,979Kilometres2003-04Trunk roadLength surveyed
305Kilometres2003-04MotorwayLength of network
296Kilometres2003-04MotorwayLength surveyed
3,071Kilometres2002-03Trunk roadLength of network
2,987Kilometres2002-03Trunk roadLength surveyed
305Kilometres2002-03MotorwayLength of network
298Kilometres2002-03MotorwayLength surveyed
3,071Kilometres2001-02Trunk roadLength of network
3,019Kilometres2001-02Trunk roadLength surveyed
305Kilometres2001-02MotorwayLength of network
296Kilometres2001-02MotorwayLength surveyed
3,071Kilometres2000-01Trunk roadLength of network
3,060Kilometres2000-01Trunk roadLength surveyed
305Kilometres2000-01MotorwayLength of network
299Kilometres2000-01MotorwayLength surveyed
Showing 1 to 100 of 208 rows
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Next update expected:August 2026

Updates

21st January 2026
Dataset first published.

Main information

Designation
Official statistics
Data provider
Welsh Government
Data source
Road conditions of motorways and A trunk roads

Overview

Summary of dataset and variables

Skidding resistance relates to wet or damp road surfaces. It is a measure of the road surface condition to the resistance between the vehicle’s tyres and the road when accelerating, braking or cornering. Testing takes place after the road surface has been pre-wetted, as the road surface will exhibit least friction and skid resistance when wet. Testing of dry road surfaces does take place from time to time, however it does not form any part of the routine skid resistance monitoring that takes place on the road network. It is assumed that in dry conditions all clean road surfaces have a high skidding resistance.

Data collection or calculation

Data is collected from SCRIM surveys

Statistical quality

Figures were calculated on a new basis from 2004, which affects all-purpose trunk roads more severely than motorways. Figures relate to road lengths surveyed in the year and in the previous year (for 2006 and earlier years). At or below investigatory level’ does not mean the roads are unsafe; it indicates a need for further investigation to determine the need for maintenance of that section of road. New figures for 2003 were back-calculated to provide a figure equivalent to the new standard used from 2004. In 2007, for the first time all surveyed lengths are taken from the same year and figures are therefore truly representative of that particular year. Also, Lane 1 length of network has been updated.

Related reports

Published by

Organisation
Welsh Government
Contact email
stats.transport@gov.wales

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