Skip to content
Welsh Government
Data Provider: Welsh Government National Statistics Skidding resistance of all Trunk Roads in Wales
None
Drop Filter Fields Here
Measure1
Road Classification[Filter]
Skid Resistance[Filter]
Year(Descending)[Filtered]
[Collapse]Motorway[Collapse]All purpose trunk
Click here to sortLength of networkClick here to sortLength surveyedClick here to sortPercentage of length surveyedClick here to sortPercentage of length surveyed at or below investigatory levelClick here to sortLength of networkClick here to sortLength surveyedClick here to sortPercentage of length surveyedClick here to sortPercentage of length surveyed at or below investigatory level
2023-243283281000.33,1893,0449510.3
2022-233283281000.23,2193,0249410.2
2021-22328327990.43,2193,033948.7
2020-213283281000.03,2273,050959.5
2019-20328326990.03,2273,044948.3
2018-193273271000.33,2273,056959.9
2017-183273271000.03,2293,0639510.4
2016-173273261000.13,2293,0449411.3
2015-163273261000.13,2613,071949.5
2014-153273271000.03,2433,193987.9
2013-14395327830.13,2183,141987.2
2012-13395318800.03,2183,035945.5
2011-12391302770.33,1602,934938.6
2010-11361279770.73,1083,1081008.3
2009-10..|The data item is not available..|The data item is not available..|The data item is not available..|The data item is not available..|The data item is not available..|The data item is not available..|The data item is not available..|The data item is not available
2008-09364311850.23,1042,972969.5
2007-08364313860.13,1042,946956.6
2006-073253251000.43,0712,8659316.7
2005-063253251000.53,0712,9799725.2
2004-053253251000.33,0712,9799720.5
2003-04305296970.63,0712,9799719.6
2002-03305298980.53,0712,987979.4
2001-02305296970.43,0713,0199814.4
2000-01305299980.33,0713,06010017.8
1999-2000305299980.23,0713,06010014.0

Metadata

Keywords

Road Skidding M4 A-Trunk

Title

Skidding resistance of all Trunk Roads in Wales

Last update

August 2024 August 2024

Next update

August 2025 (provisional)

Publishing organisation

Welsh Government

Source 1

Road conditions of motorways and A trunk roads, Welsh Government

Designation

National Statistics

Lowest level of geographical disaggregation

Wales

Geographical coverage

Wales

Data licensing

You may use and re-use this data free of charge in any format or medium, under the terms of the Open Government License - see http://www.nationalarchives.gov.uk/doc/open-government-licence

General description

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 reference periods

1995-96 to 2023-24

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.