I know that these don't exist in Milwaukee, but my friend Alia is from Long Island, NY and certain major intersections there as well as in NYC have a pretty unique trigger for use by emergency vehicles. Certain lights respond to high beams. Example: Cop is coming up to a red light, flashes high beams, opposing light goes yellow...red and then his turns to green. She says they tried it and it worked and apparently it's close to instantaneous. However, like I said, we don't have these in the fine city of Milwaukee so keep running the reds!
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