Mind the hump

By Barry Fox Speed fiends in Israel are in for a rough ride. Defence researchers have “improved” a traffic-calming road hump. Conventional humps are made of concrete or asphalt, and make a car bounce even if it’s travelling within the speed limit. The new hump is made of rubber, with a sealed air chamber connected to the atmosphere by two valved vents (GB 2 336 867). Both valves let air in, but only one lets it out. The weight of a car forces air out of the one-way valve. If the car is driving slowly,
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