I recall a time when the police in Rhodesia had a plan to stop speeding. They chose a road that many people travelled on for a long distance. (Bulawayo to Beit Bridge IIRC) At one end of the road was a policeman who noted the numberplate and time of every vehicle that entered the road. At the far end was the border, and police would check the time and numberplate of every car that drew into the border car park. If the times indicated that the driver had been averaging more than the speed limit, he got a hefty fine.
The result of that was that after the initial spate of fines, when the system became known, the police got no results at all - nobody was arriving quickly enough to have averaged above the speed limit.
So did that mean that the system worked, and that speeding along that road had been eliminated?
No, it meant that the small cafe just before the border was making a killing, as drivers waited an hour or so before entering the border area.
If there is no suitable service area for drivers to wait on a motorway that employs such a system, be prepared to see cars dawdling along at 15MPH in the last mile or so before a check camera, as drivers ensure that they do not arrive too early.
-- Cynic
