Another vehicle's speed is not measured directly — what the camera measures is how far away it is, frame by frame, and how fast that changes is its speed relative to ours, which the GPS closes. Each card is one car over the limit for a stretch of road, fastest first, with a box drawn around it so there is no doubt which one. Watch it, say whether it was speeding, and if you can tell, say what the limit there really is — that becomes a sign at the start of the stretch, and every future drive past it is judged against it.
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