I've noticed that once highway speed traps get reported in on the radio, their location seems to backward opposed to the flow of traffic. Now I've been told this is to discourage people from speeding all the way to the speed trap, then slow down and then get up to high speed again.
Why is it not the other way around? If those traps were to go forward, a driver would never be able to tell if he was about to approach the trap or not. And in practice this behaviour is not any different from the current situation.
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