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An Interstate Highway under construction , with both directions of traffic moved to one side of the roadway I-94 in Michigan, showing examples of non-interchange overpass signage in median, upcoming exit signage on right shoulder, a pre-1960 overpass with height restriction signage, newly installed cable median barrier, and parallel grooved ...
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.
In UK, the "standard minimum clearance" for structures over public highways is 16 feet 6 inches (5.03 m). [3] In United States, the "minimum vertical clearance" of overpasses on Interstate Highway System is 16 feet (4.9 m).
In South Africa and the southern region of Africa, the minimum vertical clearance of modern bridges is 5 metres (16 ft 5 in), although the legal height limit of road vehicles is still at 4.3 metres (14 ft 1 in). [7] United Kingdoms has a standard on minimum clearance of a public highway at 16 feet 6 inches (5.03 m).
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 ...
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The 1971 MUTCD also discontinued the 16-by-16-inch (41 cm × 41 cm) cutout shield for reassurance purposes, leaving only the 24-by-24-inch (61 cm × 61 cm) and 24-by-30-inch (61 cm × 76 cm) markers for all purposes. [7] In the 2009 MUTCD, the U.S. Route shield is assigned catalog number M1-4 and is discussed in Section 2D.11.
Highway engineering (also known as roadway engineering and street engineering) is a professional engineering discipline branching from the civil engineering subdiscipline of transportation engineering that involves the planning, design, construction, operation, and maintenance of roads, highways, streets, bridges, and tunnels to ensure safe and effective transportation of people and goods.