re: Do you flash oncoming traffic after passing a cop?

No and don't care either

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Do you flash oncoming traffic

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There are some cases that say it is protected speech, but I don’t think the US Supreme Court has ruled on it.

This is from a 2019 federal case from Wisconsin:

one federal district court has addressed conduct similar to that in this case and found that it is entitled to protection under the First Amendment. Elli v. City of Ellisville, Mo., 997 F. Supp. 2d 980, 984 (E.D. Mo. 2014) (“Even assuming, arguendo, that Plaintiff or another driver is communicating a message that one should slow down because a speed trap is ahead and discovery or apprehension is impending, that conduct is not illegal.”). In addition, at least two state circuit courts also have found that drivers have a constitutional right to flash their headlights. See State of Oregon v. Hill, Citation No. 034117 (Jackson Cty. (Ore.) Justice Ct. Apr. 9, 2014) (flashing vehicle headlights to warn others about presence of law enforcement is protected free speech under state constitution); State v. Walker, No. I-9507-03625 (Williamson Cty. (Tenn.) Cir. Ct. Nov. 13, 2003) (accepting First Amendment defense to charge of knowingly interfering with officer where defendant flashed headlights to warn oncoming motorists about speed trap).

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As discussed at length above, the law is far from settled about whether drivers have a First Amendment right to flash their headlights to convey a warning to oncoming vehicles. Neither the Supreme Court nor any federal court of appeals has addressed the issue.

Obriecht v. Splinter, No. 2019 WL 1779226, at *5 (W.D. Wis. Apr. 23, 2019)

I have Waze…everybody should !

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If a cop sees you flashing your lights you will almost certainly get a ticket for obstruction of justice.

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Depends on where you are. It's legal in Georgia.

Yep. There’s a cop that sits two miles or so from my house everyday at a speed limit change. He’s catching ppl speeding up before they get to the higher speed limit sign. I start flashing my lights before I get to him so he can see me doing it.

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Do you flash oncoming traffic after passing a cop?

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I do it and I add "Speed Trap" location to Google Maps/Waze

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If a cop sees you flashing your lights you will almost certainly get a ticket for obstruction of justice.

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I have never ever heard anyone getting a ticket for flashing their lights. It’s a form of free speech. Just like websites that list where roadblocks will be. It may be illegal, but courts will not likely uphold it if challenged.

Yep.