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Data Provider: Welsh Government National Statistics Motorway and A Trunk road network requiring close monitoring of structural condition, Wales
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[Collapse]Motorway[Collapse]All purpose trunk
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2015-164.33.015.976.887.05.73.914.276.293.0
2014-1511.511.919.157.687.012.26.118.663.293.0
2013-1412.813.019.055.069.014.36.217.961.568.0
2012-1311.29.120.159.076.012.86.119.062.067.0
2011-1210.08.021.960.164.09.56.119.265.265.0
2010-113.95.316.574.388.05.86.221.566.570.0
2009-104.33.618.273.9100.05.83.620.969.792.1
2008-094.64.623.467.3100.06.23.721.768.488.6
2007-083.33.312.281.2100.08.03.419.457.488.0
2006-077.94.315.871.9100.011.14.020.964.088.0
2005-066.35.020.168.6100.010.63.920.764.786.0
2004-057.37.323.162.4100.011.54.419.264.983.0
2003-048.65.921.564.0100.011.24.720.263.986.0
2002-037.65.918.867.7100.014.15.918.062.081.0
2001-025.64.619.570.3100.013.15.018.663.381.0
2000-016.62.817.473.289.012.74.819.063.581.0
1999-20005.31.817.975.089.010.84.419.165.781.0
1998-994.51.716.577.389.08.54.918.668.081.0
1997-983.71.714.580.189.07.25.018.169.780.0
1996-973.51.612.882.180.06.24.717.671.574.0
1995-963.41.111.484.188.05.04.716.873.579.0

Metadata

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

Last update
February 2017 February 2017

Next update
December 2017

Publishing organisation
Welsh Government

Source 1
Road condition data collection, Local Government Data Unit

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

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 conditions M4 A-Trunk PANDEF