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The MUTCD and SHS establish seven categories of signs for road and highway use, ... Low Clearance Warnings. W12-1 Double arrow. CW12-1 Double arrow. W12-2 Low clearance.
These signs are used to indicate tunnels, where lights are usually required, and a general change in the light level. May also indicate low ceiling clearance. Truck drivers should also watch for prohibited cargo signs (e.g., propane) upon approach to tunnels.
As a result, road signs in Australia closely follow those used in U.S., but some sign designs closely follow the ones used in the United Kingdom. Australian warning signs have a yellow diamond with a black legend, following America's practice. Australia remains the only country that still has the text-based version of the low-clearance signage.
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 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 ...
Australian warning signs have a yellow diamond with a black legend, following America's practice. Australia remains the only country that still has the text-based version of the low-clearance signage. (Most other countries now use vertical arrows in between the clearance height.)
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