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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.
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The primary US guidance is found in A Policy on Geometric Design of Highways and Streets published by the American Association of State Highway and Transportation Officials (AASHTO). [2] Other standards include the Australian Guide to Road Design Archived 2011-11-09 at the Wayback Machine, and the British Design Manual for Roads.
Some highway systems will not display correctly if the length parameter is set, because some highway entries will have multiple values for the length property at Wikidata. The above documentation is transcluded from Template:Highway system OSM map/doc .
length_ref is used for the reference for this piece of information, and the template converts the given length into both systems of measurement. length_notes, if defined, appears as a note below the length. This can be used to show former length, or future length, etc. interstate: This is usually "Interstate X (I-X)", but it can also be "Route ...
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.
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See Also Wikipedia:Route diagram template/Catalog of pictograms/generic roads; For readers: When self-defined legend is provided in the map, it takes precedence over this one.