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Lawbreaking motorists are unlikely to like this idea from Monitron
International of Kidderminster (GB 2 342 800). Speed traps currently use radar
to detect speeding vehicles and trigger a camera, which then takes two flash
photographs in quick succession. Prominent white marks in the road show the
vehicle’s position in each shot, proving how fast it is being driven. While
cameras can be hidden, drivers have learned to look out for the marks. So
Monitron simply proposes using tiny marks that drivers miss, but which the
camera can still capture.