Dumb question of the day: If you're driving in the dark and you see an approaching car that has their headlights turned off, do you turn off your lights very briefly, then back on, to let them know? I've been driving over 30 years and this was always a thing as long as I can remember.
It worked too, you'd see people turn them on after they noticed you doing this. But it doesn't seem to register with anyone now... are drivers that oblivious (likely) or is this just not a thing that people recognize?