DTLR GUIDANCE ON
1. The "Design Manual for Roads and
Bridges" (DMRB) or the manual) is a comprehensive document,
which accommodates, within a set of 15 loose-leaf volumes, all
current standards, advice notes and other published documents
relating to the design, assessment and operation of trunk roads
(including motorways). The manual is available on paper or as
a compact disc from the Stationary Office, and can be viewed on
the HA website.
2. The manual has been developed from a
number of separate series of documents previously published by
the Overseeing Organisations of England, Scotland, Wales and Northern
Ireland. Each document in the manual is numbered and has a prefix
HD, HA, BD, BA TD or TA, which nominally relates to highway, bridges
or traffic aspects of design. Other aspects are includedenvironment
and appraisal in particular.
3. The manual may be applicable in part
to other roads with similar characteristics. Where it is used
for local road schemes, it is for the responsible highway authority
to decide on the extent to which the documents in the manual are
appropriate in any particular situation.
4. The manual embodies the collective experience
of Overseeing Organisations, their agents and design organisations
over many years resulting from research and practical management
of the trunk road system. The pedigree stretches back over 30
years particularly for cornerstone standards associated with alignment,
stopping distances and road width. It is continuously reviewed,
to keep abreast of changes in practice and developments in technology,
to implement findings from research, to improve safety, to reduce
environmental impact and to give better value for money.
5. The manual has been prepared for use
by appropriately qualified and experienced professional staff.
It is neither a statutory or regulatory document nor a training
manual; neither does it cover every point in exhaustive detail.
Many matters are left to the professional expertise and judgement
of users, while others are covered elsewhere in European or British
standards, in codes of practice and in specifications that are
cross referenced in the text. The technical requirements given
in the manual must be adhered to for trunk roads except where
special circumstances arise and the straightforward application
of technical requirements cannot be justified for good reason.
Each Overseeing Organisation has procedures for considering such
proposals on their merits and accepting or rejecting them.
6. DTLR prepares general advice, some of
which is applicable to trunk roads. Of these the most relevant
are Local Transport Notes, which in most cases refer to requirements
having a statutory backing which apply fully or in part to trunk
roads. Other documents such as Traffic Advisory and Traffic Topic
Leaflets cover topics which can apply to all roads and give illustrated
examples of successful applications of layouts, techniques and
trials eg TAL 1/95 "Speed Limit SignsA guide to good
7. In addition, there are other documents,
particularly the Traffic Signs Regulations and General Directions,
the Road Traffic Regulations Act, and the Traffic Signs Manual,
which includes "Chapter 8" dealing with Traffic Safety
Measures and Signs for Road Works and Temporary Situations; these
documents apply to all roads.