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The clearance heights vary, but the limit most often cited is 10 feet, 6 inches. [14] Part of the attention comes from the seasonal nature of the bridge strikes, given that in the late summer many college students crash moving trucks into the bridges when traveling to campuses. [15] Crashes and close calls often happen multiple days in a row.
Longer bridges can reduce the width of both shoulders to 4 feet (1.2 m). Existing bridges can remain part of the Interstate system if they have at least 12-foot-wide (3.7 m) lanes with 3.5-foot (1.1 m) shoulder on the left and a 10-foot (3.0 m) shoulder on the right, except that longer bridges can have 3.5 feet (1.1 m) shoulders on both sides.
In civil engineering, clearance refers to the difference between the loading gauge and the structure gauge in the case of railroad cars or trams, or the difference between the size of any vehicle and the width/height of doors, the width/height of an overpass or the diameter of a tunnel as well as the air draft under a bridge, the width of a lock or diameter of a tunnel in the case of watercraft.
Bridges and tunnels must have a clearance of at least 4,900 mm (16 ft 15 ⁄ 16 in) wide and 6,400 mm (20 ft 11 + 15 ⁄ 16 in) high. The structure gauge S p for passenger platforms allows 4,900 mm (16 ft 15 ⁄ 16 in) only above 1,100 mm (3 ft 7 + 5 ⁄ 16 in) (the common platform height) requiring a width of 3,840 mm (12 ft 7 + 3 ⁄ 16 in ...
The upper level has a vertical clearance of 14 feet (4.3 m), and all trucks and other oversize vehicles must use the upper level. Trucks are banned from the lower level, which has a clearance of 13.6 feet (4.1 m). All lanes on both levels are 8 feet 6 inches (2.59 m) wide.
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