I've been pulled over by an officer in Iowa who had a spotter in a plane - he told me as much. I never saw the plane, but honestly I don't really remember looking either. Speed timing is really the only way that I can imagine being reliable in a plane since radar and laser accuracy could both be disrupted by turbulence. Timing, however, is an absolute, especially if the lines are far enough apart (1/2 mile+).
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"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." - B. Franklin
"There ought to be limits to freedom." - George W. Bush
"We have met the enemy and he is us." - Pogo
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