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Who knows how accurate the speed reported was if they got it using this method. Don't they have to use radar guns or is timing it good enough to convict on.

I don't know of any other systems used by aircraft to detect speed other than timing using landmarks. Almost all of the rural highways around here have "speed monitored by aircraft" signs and big white X's in the roads as reference points for timing. I have yet to be caught speeding by an aircraft, though. I can't imagine how expensive it is to survey roads that way rather than by using the traditional state trooper with a radar gun.
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- trs