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Physical devices include speed humps, speed cushions and speed tables, sized for the desired speed. Such measures normally slow cars to between 16 and 40 kilometres per hour (10 and 25 mph). Most devices are made of asphalt or concrete but rubber traffic calming products are emerging as an effective alternative with several advantages.
Common speed hump shapes are parabolic, circular, and sinusoidal. [17] In Norway, speed humps are often placed at pedestrian crossings. Generally, speed humps have a traverse distance of about 3.7 to 4.3 m (12 to 14 ft) and span the width of the road. The height of each hump ranges from 8 to 10 cm (3 to 4 in). [17]
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A white background signifies the sign is permanent, while a yellow background signifies that the sign is temporary. Warning signs are an upwards-pointing red triangle and contain a black pictogram describing the danger or obstruction. Speed limit signs are a red circle with the limitation in black. South Africa drives on the left.
Radars on speed limit signs in the neighborhood documents some drivers reaching more than 70 mph. The six speed humps from the southern stretch of the road were removed for now.
The MUTCD's W13 series of signs is for warning signs relating to advisory speeds. Speed limits in the United States are always in miles per hour. Metric advisory speed signs in kilometers per hour used to be authorized but extremely rare, usually seen near the borders with Canada and Mexico, both of which use the metric system. [5]
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