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Design Manual for Roads and Bridges - Full update

Wednesday 01 April 2020

The Design Manual for Roads and Bridges (DMRB) has now been fully updated and as from 1 April the old style 15 volume manual has been replaced by a single document.

The DMRB contains information about current standards relating to the design, assessment and operation of motorway and all-purpose trunk roads in the United Kingdom.

The new document reference comprises five characters, of which the first two are based on the location of the document within the new structure (i.e. combination of Discipline and Lifecycle codes) and the final three are a unique number allocated by the policy group responsible for the discipline to which the document is allocated.

The new Discipline structure and related codes are as follows:

G - General Principles & Scheme Governance;

L - Sustainability & Environment;

C - Civil Engineering (comprising road layout, pavement, structures and bridges, geotechnics and drainage);

T - Technology (comprising control & communications technology and road lighting).

The new Lifecycle structure and related codes are as follows:

G - General Information;

A - Appraisal;

D - Design;

C - Construction;

M - Maintenance & Operation;

S - Inspection & Assessment;

Z - Disposal.

As an example, document CD 116 ‘Geometric design of roundabouts’, the ‘C’ indicates this document relates to the Civil Engineering discipline and the ‘D’ indicates this document relates to the Design lifecycle.

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