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Inspection and assessment of road markings and road studs (formerly TD 26/17)

DMRB: Road Layout CS 126

Inspection and assessment of road markings and road studs (formerly TD 26/17)

Document Status



Civil & Structural Supplement


DMRB: Road Layout


Establishes inspection and assessment requirements for road markings and road stud assets on motorways and all-purpose trunk roads, covering frequency, inspection methods, defect categories, performance, record keeping and considers a risk based approach.


Version: 1.0.1 May 2022. Supersedes HE CS 126 Version: 0 March 2020. Supersedes TD 26/17 Traffic signs and lighting. Traffic signs and road markings. Inspection and maintenance of road markings and road studs on motorways and all-purpose trunk roads (HE, 2017). Design manual for roads and bridges (DMRB).


Publisher History

National Highways is a government company, with responsibility for operating, maintaining and improving motorways and major A roads in England. It works with the Department for Transport and was previously known as Highways England and Highways Agency.



NBS has produced specification systems and information products for construction industry professionals for more than 40 years. The National Building Specification is the recognised UK national standard and is used by over 5,000 organisations. NBS is part of RIBA Enterprises Ltd.

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