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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 ...
Through urban areas, at least one routing is to have 16-foot (4.9 m) clearances, but others may have a lesser clearance of 14 feet (4.3 m). Sign supports and pedestrian overpasses must be at least 17 feet (5.2 m) above the road, except on urban routes with lesser clearance, where they should be at least 1 foot (30 cm) higher than other objects.
For example, the United States requires a height of 14 feet (4.27 m) for highway bridges. [1] Some vehicle standards are made to conform to these expectations. In much of the United States, the maximum height of a semi truck, in the absence of an approved overheight permit, is 13 feet, 6 inches (4.12 m). [2]
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). [2] In UK, the "standard minimum clearance" for structures over public highways is 16 feet 6 inches (5.03 m). [3]
The clearance below required under bridges for the largest ships—container ships, ocean liners and cruise ships—is around 220 feet (67 m) so there are often bridges with approximately that height located in coastal cities with bays or inlets, such as New York City's Verrazzano-Narrows Bridge and San Francisco's Golden Gate Bridge.
Construction began in May 1980; the tunnel opened on November 23, 1985. Having consumed some $750 million (equivalent to $2.1 billion in 2023), it was the most expensive Interstate project until surpassed by the Big Dig in Boston. [3] As of 2009, it was used by 43.4 million vehicles annually. [needs update]
[14] [15] The vertical clearance from the roadway to the upper arched beam in the outer lane was 14 feet 7 inches (4.45 m), and all trucks with oversize loads were expected to travel in the inside lane where the clearance was around 17 feet (5.2 m) (part of the "fracture-critical" design issue rectified after the incident).
The depth of clearance is 40 ft (12.2 m) for the ship channel over the tunnel. [1] This is the same clearance as the older Bankhead Tunnel. The tunnel was officially opened to traffic on February 9, 1973, after $50 million ($291.8 million in 2020 dollars) was spent to construct it. [ 2 ]