Quote:
Originally Posted by pennsiveguy
As I recall from back in the 80's, it was a quick on-off-on of the regular driving lights, not a flash to high beams and back. It was really common. Also, CB radios were the first version of Waze. If there was a cop setting up to shoot radar somewhere, he wouldn't even have the cruiser in "Park" and it'd be announced on the CB.
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So the other thing I'll mention along the "free speech" argument goes back to when I worked with Morality and the Drug Squad. When we were doing drug buys on the street occasionally someone would recognize the UC and start yelling that they were a cop, that person occasionally got arrested for Obstruct Police.
For the most part, flashing at oncoming motorist to warn them is probably not going to land you in trouble, but if the police see you do it they may want to talk to you and that may lead to other offences being found. Food for thought.