'Drivers once commonly flashed their headlights at oncoming cars that had their high beams on. But according to William E. Van Tassel, the manager of driver training programs at AAA's headquarters in Heathrow, Fla., "We really have gotten away from that."
The driver with the blinding high beams might be impaired by alcohol. Flashing your own high beams, particularly at night, could make that person's vision, possibly already diminished by drinking and darkness, even worse, Mr. Van Tassel said.
He also advised against flashing your lights because of the dangers of the so-called moth effect, which occurs when drivers are mesmerized by bright or flashing lights and head in the direction they are looking. Flashing your lights could also be interpreted as an act of aggression.
Hmmm… I still thought this was the rule. I remember flashing my brights on a guy who I thought had his on. When he flashed back, I saw that they weren’t his brights, just a lot brighter than I’m used to.
Sometimes drivers at a four-way stop flash their lights to signal others to go ahead.Never heard this one, wouldn't trust it.