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A speed bump is a bump in a roadway with heights typically ranging between 8 and 10 centimetres (3 and 4 in). The traverse distance of a speed bump is typically less than or near to 0.3 m (1 ft); contrasting with the wider speed humps, which typically have a traverse distance of 3.0 to 4.3 m (10 to 14 ft). [5] [6]
A Federal Highway Administration study shows that they may only reduce average vehicle speeds by up to 10 mph, and only within a limited area around the bump itself. This decrease in speed may not ...
Today, there are more than 25 million Botts' dots in use in California, [6] though they have started falling out of favor. In 2017, Caltrans announced that it would stop using Botts' dots as the sole indicator of lane division, due to cost and worker safety, and in order to make roadways more compatible with self-driving cars.
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.
The operator of Speed Bump Olympics, who posted his 99th video on Wednesday (an 11-minute, 49-second clip entitled “Speed Bump Fails 55”), also placed the blame on drivers.
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