I remember being pulled over in high school for flashing my brights at the truck ahead of me. (Truck was being driven by my friend and I wanted him to pull down a side street so we could talk.)
Cop told us flicking your brights is considered stunting.
Nevertheless, I still do it to this day, especially to get people out of the left lane. Sometimes it works, and sometimes it doesn't. Those people probably can't figure out why I am flashing my brights at them.
Doing it at night is a different story. It definitely catches the others drivers attention, but I hate blinding people... but I guess if it does the job...
Looking around
Wondering what became
Of what I once knew