I was told the a radar/laser beam bounces off of a metal object and returns to the sending unit. In the case of the majority of vehicles that metal object is positioned straight up and down (e.g. grille, radiator, fender) allowing the beam to return in a straight path. In a Corvette the metal object would be the radiator. The radiator is angled and when the beam hits it it's deflected.The farther from the sending unit, the more deflection.
I've never seen anything to prove this is correct and I'm not a LEO.
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