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Originally Posted by JVZ104
Try flashing your high beams at a stoplight sometime. You will sometimes get the same effect, depending on the angle of your headlights.
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I think this is actually a myth because these "traffic light priority" devices do not emit a visible light. I believe that they work on IR. I know/knew someone who had one from 3M, not some Interet store. He mounted it on a camera flash mount so it was portable from car to car. It worked like a champ but I always felt that he shouldn't be using it.