Wasn't this settled years ago? Or was that another state?
Guess so.
In the United States, the legality of headlight flashing varies from state to state. Some states consider that drivers have a First Amendment right to flash their headlights. In other states, law enforcement officers give citations for headlight flashing under three types of laws: (1) laws prohibiting a person from obstructing a police investigation, (2) laws prohibiting a person from having flashing lights on their vehicle, and (3) laws prohibiting shining a vehicle’s high beams at oncoming traffic.
All three are pretty ridiculous.
(1) Obstructing a police investigation: If warning other drivers constitutes obstruction, then so do neighborhood watch and home security system signs, or simple warnings to criminals that "I'll call the police!".
(2) Prohibition against having flashing lights on a vehicle: If high beams are considered illegal flashing lights, every vehicle in the country is illegal. Arrest everyone.
(3) Prohibiting shining high beams at oncoming traffic: This is the most legitimate justification of the three. But again, there's not a driver alive who doesn't on occasion forget to drop to low beams. And the widely accepted reminder is to briefly flash high beams. A brief flash is also the widely-accepted method of communicating to merging drivers that they are clear to merge. Truckers commonly thank such a flash by briefly flashing their own running lights. A brief flash is a courtesy, and one much appreciated by most.
Bottom line: all three of these justifications are cop-outs (no pun intended) to avoid the truth of it: slowing speeding traffic ceased years ago to be the purpose of writing tickets.
If the goal were to slow traffic, they'd
welcome people giving warnings. In fact, they'd welcome people giving
false warnings - flashes when no police are present, just like when neighborhood watch and home security system signs are put up when there's no watch or system. It serves as a deterrent, in this case against speeding.
It's the same reason that in several parts of the country (Tennessee is notorious for this), being in possession of cash is by itself reason enough for the state to confiscate it under suspicion of something nefarious, even if there's no other indication of anything illegal taking place. Even if your innocence is proven beyond any doubt (a burden which the accused shouldn't have to bear in this country), many state and local governments refuse to return the confiscated money, or it costs many thousands more in legal fees to force that return than what was confiscated to begin with.
The
real purpose of writing speeding tickets is that it's a huge source of revenue for the county, municipality, and state. Flashed warnings get in the way of that back-door tax. Sad to say, but many governments now operate under the assumption that we work for them.
</rant>