FYI: if you're signaling an 18 wheeler, don't flash your brights. Just turn them off and on two or three times. It's easier to see the signal and doesn't blind them, giving them purple spots to avoid for the next 10 minutes. As for signaling other drivers about a cop, screw em. If they're dumb enough to drive like an idiot without scouting the area for snakes it the weeds, it's their problem. lol - Problem solved. No high beams needed.