Motorway and A Trunk road network requiring close monitoring of structural condition, Wales
- High level information
- Summary information
- Statistical quality information
- Open Data
TitleMotorway and A Trunk road network requiring close monitoring of structural condition, Wales
Last updateFebruary 2017
Next updateDecember 2017
Publishing organisationWelsh Government
Source 1Road condition data collection, Local Government Data Unit
Geographical coverageLocal authorities
Data licensingYou 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 descriptionCalculated 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 calculationDeflectograph 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 publicationAnnual
Statistical qualityIn 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 This has become superseded by the Pandef method of processing.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.