Back in the 1970s when I was maybe 7 or 8 yrs. old, my family would take a trip
across country to stay with relatives for a couple weeks of vacation in late
summer. Of course back then we would have the CB radio on listening to the
truckers. Often that where you'd hear of speed traps (which is where cops,
referred to as Smokey in CB lingo, would be hiding to spring out and
catch those going above the speed limit).
Well, one day while en route, we heard this one trucker come on and yell out that there was a Smokey hidden at a certain mile marker.
We knew it was right near us because all of a sudden you could see brake lights for miles. It was like Christmas! :D