Percentage of motorway and trunk road network requiring close monitoring of structural condition

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Data valuesData descriptionFinancial yearRoad classWork required
88Percentage of network surveyed2024-25Trunk roadPercentage of network surveyed
100Percentage of network surveyed2024-25MotorwayPercentage of network surveyed
88Percentage of network surveyed2023-24Trunk roadPercentage of network surveyed
100Percentage of network surveyed2023-24MotorwayPercentage of network surveyed
89Percentage of network surveyed2022-23Trunk roadPercentage of network surveyed
100Percentage of network surveyed2022-23MotorwayPercentage of network surveyed
88Percentage of network surveyed2021-22Trunk roadPercentage of network surveyed
100Percentage of network surveyed2021-22MotorwayPercentage of network surveyed
87Percentage of network surveyed2020-21Trunk roadPercentage of network surveyed
100Percentage of network surveyed2020-21MotorwayPercentage of network surveyed
87Percentage of network surveyed2019-20Trunk roadPercentage of network surveyed
99Percentage of network surveyed2019-20MotorwayPercentage of network surveyed
86Percentage of network surveyed2018-19Trunk roadPercentage of network surveyed
99Percentage of network surveyed2018-19MotorwayPercentage of network surveyed
85Percentage of network surveyed2017-18Trunk roadPercentage of network surveyed
99Percentage of network surveyed2017-18MotorwayPercentage of network surveyed
80Percentage of network surveyed2016-17Trunk roadPercentage of network surveyed
97Percentage of network surveyed2016-17MotorwayPercentage of network surveyed
93Percentage of network surveyed2015-16Trunk roadPercentage of network surveyed
87Percentage of network surveyed2015-16MotorwayPercentage of network surveyed
93Percentage of network surveyed2014-15Trunk roadPercentage of network surveyed
87Percentage of network surveyed2014-15MotorwayPercentage of network surveyed
68Percentage of network surveyed2013-14Trunk roadPercentage of network surveyed
69Percentage of network surveyed2013-14MotorwayPercentage of network surveyed
67Percentage of network surveyed2012-13Trunk roadPercentage of network surveyed
76Percentage of network surveyed2012-13MotorwayPercentage of network surveyed
65Percentage of network surveyed2011-12Trunk roadPercentage of network surveyed
64Percentage of network surveyed2011-12MotorwayPercentage of network surveyed
70Percentage of network surveyed2010-11Trunk roadPercentage of network surveyed
88Percentage of network surveyed2010-11MotorwayPercentage of network surveyed
92Percentage of network surveyed2009-10Trunk roadPercentage of network surveyed
100Percentage of network surveyed2009-10MotorwayPercentage of network surveyed
89Percentage of network surveyed2008-09Trunk roadPercentage of network surveyed
100Percentage of network surveyed2008-09MotorwayPercentage of network surveyed
88Percentage of network surveyed2007-08Trunk roadPercentage of network surveyed
100Percentage of network surveyed2007-08MotorwayPercentage of network surveyed
88Percentage of network surveyed2006-07Trunk roadPercentage of network surveyed
100Percentage of network surveyed2006-07MotorwayPercentage of network surveyed
86Percentage of network surveyed2005-06Trunk roadPercentage of network surveyed
100Percentage of network surveyed2005-06MotorwayPercentage of network surveyed
83Percentage of network surveyed2004-05Trunk roadPercentage of network surveyed
100Percentage of network surveyed2004-05MotorwayPercentage of network surveyed
86Percentage of network surveyed2003-04Trunk roadPercentage of network surveyed
100Percentage of network surveyed2003-04MotorwayPercentage of network surveyed
81Percentage of network surveyed2002-03Trunk roadPercentage of network surveyed
100Percentage of network surveyed2002-03MotorwayPercentage of network surveyed
81Percentage of network surveyed2001-02Trunk roadPercentage of network surveyed
100Percentage of network surveyed2001-02MotorwayPercentage of network surveyed
81Percentage of network surveyed2000-01Trunk roadPercentage of network surveyed
89Percentage of network surveyed2000-01MotorwayPercentage of network surveyed
81Percentage of network surveyed1999-00Trunk roadPercentage of network surveyed
89Percentage of network surveyed1999-00MotorwayPercentage of network surveyed
81Percentage of network surveyed1998-99Trunk roadPercentage of network surveyed
89Percentage of network surveyed1998-99MotorwayPercentage of network surveyed
80Percentage of network surveyed1997-98Trunk roadPercentage of network surveyed
89Percentage of network surveyed1997-98MotorwayPercentage of network surveyed
74Percentage of network surveyed1996-97Trunk roadPercentage of network surveyed
80Percentage of network surveyed1996-97MotorwayPercentage of network surveyed
79Percentage of network surveyed1995-96Trunk roadPercentage of network surveyed
88Percentage of network surveyed1995-96MotorwayPercentage of network surveyed
2.6Percentage of network requiring close monitoring of structural condition2024-25Trunk roadNow
1.5Percentage of network requiring close monitoring of structural condition2024-25Trunk roadIn 0-4 years
8.4Percentage of network requiring close monitoring of structural condition2024-25Trunk roadIn 5-19 years
87.5Percentage of network requiring close monitoring of structural condition2024-25Trunk roadIn 20 or more years
7.4Percentage of network requiring close monitoring of structural condition2024-25MotorwayNow
2.2Percentage of network requiring close monitoring of structural condition2024-25MotorwayIn 0-4 years
9.8Percentage of network requiring close monitoring of structural condition2024-25MotorwayIn 5-19 years
80.6Percentage of network requiring close monitoring of structural condition2024-25MotorwayIn 20 or more years
2.6Percentage of network requiring close monitoring of structural condition2023-24Trunk roadNow
1.7Percentage of network requiring close monitoring of structural condition2023-24Trunk roadIn 0-4 years
8.9Percentage of network requiring close monitoring of structural condition2023-24Trunk roadIn 5-19 years
86.8Percentage of network requiring close monitoring of structural condition2023-24Trunk roadIn 20 or more years
7.3Percentage of network requiring close monitoring of structural condition2023-24MotorwayNow
2.3Percentage of network requiring close monitoring of structural condition2023-24MotorwayIn 0-4 years
11.3Percentage of network requiring close monitoring of structural condition2023-24MotorwayIn 5-19 years
79.1Percentage of network requiring close monitoring of structural condition2023-24MotorwayIn 20 or more years
2.6Percentage of network requiring close monitoring of structural condition2022-23Trunk roadNow
2.2Percentage of network requiring close monitoring of structural condition2022-23Trunk roadIn 0-4 years
10.7Percentage of network requiring close monitoring of structural condition2022-23Trunk roadIn 5-19 years
84.5Percentage of network requiring close monitoring of structural condition2022-23Trunk roadIn 20 or more years
7.4Percentage of network requiring close monitoring of structural condition2022-23MotorwayNow
3.1Percentage of network requiring close monitoring of structural condition2022-23MotorwayIn 0-4 years
13.3Percentage of network requiring close monitoring of structural condition2022-23MotorwayIn 5-19 years
76.3Percentage of network requiring close monitoring of structural condition2022-23MotorwayIn 20 or more years
2.5Percentage of network requiring close monitoring of structural condition2021-22Trunk roadNow
2.1Percentage of network requiring close monitoring of structural condition2021-22Trunk roadIn 0-4 years
10.4Percentage of network requiring close monitoring of structural condition2021-22Trunk roadIn 5-19 years
85.0Percentage of network requiring close monitoring of structural condition2021-22Trunk roadIn 20 or more years
7.3Percentage of network requiring close monitoring of structural condition2021-22MotorwayNow
2.8Percentage of network requiring close monitoring of structural condition2021-22MotorwayIn 0-4 years
12.7Percentage of network requiring close monitoring of structural condition2021-22MotorwayIn 5-19 years
77.2Percentage of network requiring close monitoring of structural condition2021-22MotorwayIn 20 or more years
2.9Percentage of network requiring close monitoring of structural condition2020-21Trunk roadNow
2.1Percentage of network requiring close monitoring of structural condition2020-21Trunk roadIn 0-4 years
9.6Percentage of network requiring close monitoring of structural condition2020-21Trunk roadIn 5-19 years
85.4Percentage of network requiring close monitoring of structural condition2020-21Trunk roadIn 20 or more years
6.4Percentage of network requiring close monitoring of structural condition2020-21MotorwayNow
3.4Percentage of network requiring close monitoring of structural condition2020-21MotorwayIn 0-4 years
14.4Percentage of network requiring close monitoring of structural condition2020-21MotorwayIn 5-19 years
75.8Percentage of network requiring close monitoring of structural condition2020-21MotorwayIn 20 or more years
Showing 1 to 100 of 300 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

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. Since 2015-16, figures have been calculated using Pandef processing software.

Data collection or 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.

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.

Related reports

Published by

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

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