Smart speed-humps retract at low speed

Speed-humps are an undeniably effective way to slow down traffic in areas where high-speed poses an increased risk, but you can often get more of a bump than you bargained for, and if you happen to drive a low-slung sportscar this can be bad news indeed. Here's an idea that solves the problem by ensuring low-speeds while minimizing the impact on the motor vehicle.

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