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Welsh Government
Data Provider: Welsh Government Accredited Official Statistics Percentage of Motorway and A Trunk road network requiring close monitoring of structural condition
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[Collapse]Motorway[Collapse]All purpose trunk
Click here to sortPercentage of network surveyedClick here to sortNowClick here to sortIn 0-4 yearsClick here to sortIn 5-19 yearsClick here to sortIn 20 or more yearsClick here to sortPercentage of network surveyedClick here to sortNowClick here to sortIn 0-4 yearsClick here to sortIn 5-19 yearsClick here to sortIn 20 or more years
2023-241007.32.311.379.1882.61.78.986.8
2022-231007.43.113.376.3892.62.210.784.5
2021-221007.32.812.777.2882.52.110.485.0
2020-211006.43.414.475.8872.92.19.685.4
2019-20996.23.014.976.0872.72.09.386.0
2018-19996.43.115.674.9862.82.39.685.3
2017-18994.93.716.175.3851.81.68.288.5
2016-17974.73.818.373.2801.91.77.988.5
2015-16874.33.015.976.8935.73.914.276.2
2014-158711.511.919.157.69312.26.118.663.2
2013-146912.813.019.055.06814.36.217.961.5
2012-137611.29.120.159.06712.86.119.062.0
2011-126410.08.021.960.1659.56.119.265.2
2010-11883.95.316.574.3705.86.221.566.5
2009-101004.33.618.273.9925.83.620.969.7
2008-091004.64.623.467.3896.23.721.768.4
2007-081003.33.312.281.2888.03.419.457.4
2006-071007.94.315.871.98811.14.020.964.0
2005-061006.35.020.168.68610.63.920.764.7
2004-051007.37.323.162.48311.54.419.264.9
2003-041008.65.921.564.08611.24.720.263.9
2002-031007.65.918.867.78114.15.918.062.0
2001-021005.64.619.570.38113.15.018.663.3
2000-01896.62.817.473.28112.74.819.063.5
1999-2000895.31.817.975.08110.84.419.165.7
1998-99894.51.716.577.3818.54.918.668.0
1997-98893.71.714.580.1807.25.018.169.7
1996-97803.51.612.882.1746.24.717.671.5
1995-96883.41.111.484.1795.04.716.873.5

Metadata

Statistical quality

In past years there have been two main methods of processing Deflectograph data. WG has made use of the Deflec method, which has processed all of the surveys up to 2014/15. This has become superseded by the Pandef method of processing.

This change in software has aligned the Welsh Government with the rest of the UK, including Highways England and Transport Scotland.

Keywords

Road Condition Motorway A Trunk PANDEF M4

Title

Motorway and A Trunk road network requiring close monitoring of structural condition, 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

Geographical coverage

Local authorities

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

Calculated using Deflectograph. The structural condition of a section of road is in need of close monitoring when it has a negative residual life. Figures are for the whole flexible network.
Percentages may not add up to 100 per cent due to rounding.
Excludes concrete pavements and elevated carriageways.
2015-16 Figures calculated using Pandef processing software

Data collection and calculation

Deflectograph surveys: Information on the structural condition of major roads is usually collected by means of Deflectograph Surveys. A Deflectograph is an automated technique for measuring the deflection of a road surface under a standard load. Software such as DEFLEC and PANDEF have been developed to allow the structural condition of the road to be derived from the measured deflections, given certain data about the construction of the road and about the traffic loading.

Frequency of publication

Annual

Data reference periods

1995-96 to 2023-24