Does tin foil in hubcaps, honking horns, dragging chains, etc. affect whether a vehicle can be clocked with radar?
No. The tin foil trick is useless and probably originated with the Allies’ use of tin foil strips (it was called window) dropped from bombers over Europe in World War II to confuse enemy radar. Police radar doesn’t operate in the same manner as search radars in that it clocks a target that is already visible rather than being used to locate the target in the first place. Horn honking has no effect on radar since the audio of the horn does not affect the frequency of the transmitted signal. At one time a rumor circulated claiming that dragging a chain from a vehicle would foil police radar. All horn honking or dragging chains will do for a speeder is make him a noisy speeder.
