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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.
A tell-tale warning of a low clearance over a road. A tell-tale, also known as a bridge warning, is a series of ropes suspended over railway tracks to give warning to the engineer, and more importantly the brakeman who may be scampering across the tops of the cars, that the train is approaching a low-clearance obstacle, such as a tunnel or a bridge.
4.12 W12 series: Low clearance warnings. 4.13 W13 series: Advisory speeds. 4.14 W14 series: Dead end streets and no passing zones. ... 7 Construction information signs.
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.
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]
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Several 175-foot curves of the BMT Eastern Division do not permit the 75-foot cars through them [12] 50 m (160 ft) Gotham Curve: 1,435 mm (4 ft 8 + 1 ⁄ 2 in) Cromford and High Peak Railway, Derbyshire, England until 1967 Matadi-Kinshasa Railway: 762 mm (2 ft 6 in) original 762 mm (2 ft 6 in) line. Welsh Highland Railway: 600 mm (1 ft 11 + 5 ...
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