Every now and again one of our local police departments puts out their "passive traffic safety device" ... one of those billboard thingies that tells you your speed as you pass it, and reminds you to slow down, etc.
This, however, usually backfires. Many people have this funny streak in 'em (I do anyway) that sees such a device as a challenge. How high can I make it go??? (Which is why it is NEVER a good idea to take a Breathalyzer to a party, incidentally).
Thus far I haven't encounted one of the officers hiding in a sidestreet just on the other side of one of these things, but I have seen some pretty impressive numbers on the billboard.
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