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The DMRB is used to design trunk roads such as the A20 in the UK. The Design Manual for Roads and Bridges (DMRB) is a series of 15 volumes that provide standards, advice notes and other documents relating to the design, assessment and operation of trunk roads, including motorways in the United Kingdom, and, with some amendments, the Republic of Ireland.
Section 21401 legally requires all traffic control devices on streets and highways to conform to these standards. Therefore, the manual is used by state, county, and municipal highway departments, as well as by private construction firms, to ensure that the traffic control devices they use conform to the state standard.
The Manual on Uniform Traffic Control Devices for Streets and Highways (usually referred to as the Manual on Uniform Traffic Control Devices, abbreviated MUTCD) is a document issued by the Federal Highway Administration (FHWA) of the United States Department of Transportation (USDOT) to specify the standards by which traffic signs, road surface markings, and signals are designed, installed ...
The American Association of State Highway and Transportation Officials (AASHTO) is a standards setting body which publishes specifications, test protocols, and guidelines that are used in highway design and construction throughout the United States. Despite its name, the association represents not only highways but air, rail, water, and public ...
The manual is also used in some parts of the Commonwealth. [20] The authority also produces the Manual of Contract Documents for Highway Works (MCHW), and Asset Maintenance and Operation Requirements (AMOR) which supersedes the Network Maintenance Manual and Routine and Winter Service Codes, and its predecessor the Trunk Road Maintenance Manual.
The first edition of the Highway Capacity Manual was released in 1950 and contained 147 pages broken apart into eight parts. It was the result of a collaborative effort between the Transportation Research Board (TRB) and the Bureau of Public Roads , the predecessor to the Federal Highway Administration .
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The following section pertains to only North American highway LOS standards as in the Highway Capacity Manual (HCM) and AASHTO Geometric Design of Highways and Streets ("Green Book"), using letters A through F, with A being the best and F being the worst, similar to academic grading. A: free flow. Traffic flows at or above the posted speed ...