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https://en.wikipedia.org › wiki › Speed_bump
Speed bump - Wikipedia
Speed bumps (also called traffic thresholds, ... 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). ... The Department for Transport defines the regulations for the design and use of road humps.
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Anything more is offroad.
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