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Fuck Cars
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I've also heard of arrays of cameras being used along an entire street. So even if you aren't speeding at one camera, it will know your average speed across the whole street and if you were speeding between cameras.
Yep. Average speed cameras. They work great on roads with no exits or turns for a while. They detect your time entering the zone, and the time exiting and work out your average speed
They don't work on city streets as 1 minute at a red light, or even 15 seconds traversing a roundabout, messes up the average
We also have aerial speed checks - a plane circling above a highway identifies speeding cars and radios to police ahead.