re: Small plane flying over stretches of LA slow and low...

quote:

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This is exactly how it works. You ever seen those big white lines painted across the shoulder? They're in pairs, spaced 1/8th of a mile apart. The plane clocks how quickly you travel that 1/8th mile. I learned this from a state trooper in a defensive driving class I once took to lower my insurance rate.

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They even have a custom stopwatch type gizmo that does the calculation, they press start when the vehicle crosses the first marker, and stop when it hits the second, and it reads out the speed in miles per hour, no arithmetic required.