Vertical clearance

In roadways, vertical clearance is the measurement from the ground or the road pavement to the bottom of overpasses or bridges.^[2][3]

American Association of State Highway Officials (AASHO) established Interstate Highway standards which included minimum vertical clearance of 14 feet (4.3 m). The Department of Defense later informed that the clearance was not sufficient for national defense purposes and wanted the vertical clearance to be raised to 17 feet (5.2 m). Eventually, the new standards were approved in 1960 to have the minimum vertical clearance of new structures to be 16 feet (4.9 m). There were up to 2,650 existing overpasses in 1967 that were not in compliance with the new standards. The decision was made to only raise those 350 overpasses that served up to 95% of major military installations. Other overpasses were left to be reconstructed to the new minimum vertical clearance at later times.^[2]

Australia defines minimum vertical clearance based on types of roads. The minimum vertical clearance is 5.4 metres (17 ft 9 in) for main roads and highways, and 4.6 metres (15 ft 1 in) for other local roads with road authority approval. For high and very high clearance roads, the values are between 5.9 metres (19 ft 4 in) and 6.5 metres (21 ft 4 in).^[4]

Eurocode 1: Actions on structures has a definition of "physical clearance" between roadway surface and the underside of bridge element. The code also defines the clearance that is shorter than the physical clearance to account for sag curves, bridge deflection and expected settlements) with a recommendation of minimum clearance of 5 metres (16 ft 5 in).^[5]

In Singapore, the minimum vertical clearance is 5.4 metres (17 ft 9 in). The clearance for overhead signs is 5.7 metres (18 ft 8 in) and the clearance for the soffit or underside of overpasses is 10 metres (32 ft 10 in).^[6]

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). Any bridges that do not meet the clearance requirement are considered to be "low bridges" and they require to have signage to indicate the clearance.^[8]

Horizontal clearance

In United States, the term "horizontal clearance" is used interchangeably with "lateral offset". This is the space from the edge of the roadway that is clear from vertical obstructions such as sign posts, utility poles, and fire hydrants. The horizontal clearance is used in urban environments where these objects are expected to be near roadways. The horizontal clearance are to prevent overhung elements such as side mirrors of large vehicles driven at the extreme edge of the roads to hit such objects. It also allows opening curbside doors of parked vehicles. Minimum horizontal clearance in US standard is 1.5 feet (0.46 m). It is to be noted that horizontal clearance is not the same concept as clear zone which is used in non-urban highways.^[19][20]

Some countries have specific horizontal clearances from the edge of the roads for specific types of objects next to the roads. For example, India has horizontal clearance of 10 metres (32 ft 10 in) for electrical and telecommunication poles, and 30 centimetres (12 in) for street light poles of roads with curbs. For roads without curbs, the clearance for that is 1.5 metres (4 ft 11 in) given that the minimum clearance from the center line of the roads is 5 metres (16 ft 5 in).^[21]

For roadways that require passing under some structures such as tunnels, there are standards on the entire width of the roads known as horizontal curb-to-curb and wall-to-wall clearances. American Association of State Highway and Transportation Officials (AASHTO) recommends having minimum curb-to-curb clearance for two-lane highways of 24 feet (7.3 m) and wall-to-wall clearance of 30 feet (9.1 m), while desired curb-to-curb clearance should be 39 feet (12 m), and wall-to-wall clearance should be 44 feet (13 m).^[22]

For bike paths, there are two types of horizontal clearances. The first type is the horizontal clearance of any obstacles on the paths. An example is the use of bollards to prevent cars from entering bike paths. The horizontal clearance on the paths defines a minimum clearance of adjacent obstacles such as those bollards to allow clear flowing of bike traffic. Some European countries have that specification between 1.6 metres (5 ft 3 in) and 1.75 metres (5 ft 9 in). The second type is horizontal clearance next to the paths. This clearance is a distance from the edge of the biking paths to any vertical obstacles such as poles, fences, and tree branches to prevent pedal or handlebar from hitting such obstacles. The clearance values may depend on the heights and types of the obstacles. For example, in Flanders, the horizontal clearance next to the paths for poles, lampposts and trees is 0.75 metres (2 ft 6 in), and for walls and fences is 1 metre (3 ft 3 in). The horizontal clearance from the edge of the path to the curb is based on curb heights. For curbs of heights up to 7 centimetres (2.8 in), the horizontal clearance is 0.25 metres (9.8 in), and for higher curbs, the clearance is 0.5 metres (1 ft 8 in).^[23]