Design Manual for Roads and Bridges

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The Design Manual for Roads and Bridges (DMRB) is a series of 15 volumes that provide official standards, advice notes and other documents relating to the design, assessment and operation of trunk roads, including motorways in the United Kingdom.

DMRB was originally published in 1992 and covered roads in England and Wales. Its remit was subsequently extended to include roads in Scotland and Northern Ireland. DMRB is managed by the Highways Agency on behalf of the agencies responsible for trunk roads in Scotland, Wales and Northern Ireland.

The volumes contain technical requirements and guidance on a wide range of topics, such as:

a) technical and other procedures and methods to be employed;
b) analytical criteria to be used;
c) appraisal requirements;
d) dimensional requirements;
e) numerical and statistical data.

In terms of scheme appraisal, the cost-benefit and environmental impact assessment methods set out in DMRB provide important inputs into the approach used to appraise road schemes, called the New Approach to Appraisal.

The volumes are:

Volume 1 - Highway Structures: Approval Procedures and General Design
Volume 2 - Highway Structures: Design (Substructures and Special Structures), Materials
Volume 3 - Highway Structures: Inspection and Maintenance
Volume 4 - Geotechnics and Drainage
Volume 5 - Assessment and Preparation of Road Schemes
Volume 6 - Road Geometry
Volume 7 - Pavement Design and Maintenance
Volume 8 - Traffic Signs and Lighting
Volume 9 - Traffic Control and Communications
Volume 10 - Environmental Design
Volume 11 - Environmental Assessment
Volume 12 - Traffic Appraisal of Road Schemes
Volume 13 - Economic Assessment of Road Schemes
Volume 14 - Economic Assessment of Road Maintenance
Volume 15 - Economic Assessment of Road Schemes in Scotland