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TRAFFIC CALMING - SINUSOIDAL, `H' AND `S' HUMPS
D C Webster, R E Layfield
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Abstract
The original work on speed reducing road humps was carried out in the 1970's at TRL and was based on circular profile (round-top) humps of various dimensions. These track trials led to the adoption of the 'standard 3.7 metre long' circular profile hump which can be up to 100 mm high. Since the 1980's the regulations governing the use of road humps in Great Britain have been gradually relaxed to allow greater flexibility in the shape of humps so as to include flat-top humps, raised junctions and speed cushions. The current regulations do not specify an exact hump profile providing the humps are between 25 and 100 mm in height and at least 900 mm long. This report reviews some of novel or 'non-standard' hump profiles which have been used or trialed in the Netherlands, Denmark and Great Britain. Results have been obtained for sinusoidal humps, modified round-top humps and modified sinusoidal humps, flat-top humps with sinusoidal ramps, 'H' humps and 'S' humps. (A)