This is so totally a urban legend... And the guy who invented it was not even well documented :
1/ the radars used to check road speed are very different from the detection and ranging radars aboard warplanes.
2/ the only thing that could make a Early Warning System aboard a fighter-bomber plane react is a Target Acquisition radar, which directs all its energy on one single target, and do not sweep at all : again, this is very different from both a detection radar and a road speed check radar.
3/ the Sidewinder is a short ranged, very light and agile, infrared guided fire-and-forget AIR-TO-AIR missile... It would be absolutely useless against a ground target, although if it exploded near enough, the poor constable would most certainly die...
4/ there is no such thing as "automated protection system" that would fire deadly weapons without the pilot's guidance. Thanks to whoever decided this, we've seen enough of doomsday scenarii in movies where the computers wage war on the poor humans...
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