Roads that suck energy out of speeders

Here is an idea to make speeding expensive for those breaking the rules. Monitor their speed passively via an energy absorbing road surface. Sleeping policemen that deform with a rate-adaptive material would ‘steal’ the speed from those going faster, driving up their fuel costs, and, perhaps by doing this with valves and pneumatics, the resulting energy could power road signs and lighting.

Slower vehicles would be less affected by this, and so driving that bit slower would actually make the journey nicer, without having to keep trying to accelerate, and also, perhaps, without the large vertical displacements that are currently the only way to slow drivers down.

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