Road condition statistics: technical note. Section 3: measuring surface condition using manual visual surveys
Publication Year
2026
Document Status
Current
Abstract
Provides a guide to road condition statistics and contains technical information to assist in interpreting those statistics. Covers: CHART, Coarse Visual Inspection (CVI), Detailed Visual Inspection (DVI), carriageway defects measured by CVI and DVI, wheel track cracking, transverse or reflection cracking, whole carriageway cracking, wheel track rutting, deterioration of the wearing course, settlement and subsidence, edge deterioration, calculation of road condition using DVI and CVI data, chopping to form rating lengths, calculating defect ratings, calculating condition indices, merging to form defect lengths, obtaining National Indicators (Best Value Performance Indicators), further information on CHART, CVI, DVI and the use of data.
Document History
Last updated: 21 January 2026. Sourced from: https://www.gov.uk/government/publications/road-condition-statistics-technical-note/section-3-measuring-surface-condition-using-manual-visual-surveys and converted to pdf. Whilst we endeavour to capture all updates it is subject to receiving alerts from the publisher and there may be formatting or punctuation changes applied to the html version that do not affect the text. Document type: guidance.. First published: 21 January 2026.
Publisher Information
Department for Transport
The Department for Transport is a UK Government department that provides leadership across the transport sector to achieve its objectives, working with regional, local and private sector partners to deliver many of the services. These activities were formerly carried out by the Department for Transport, Local Government and the Regions.
