I should also clarify a little: I've never heard of flashing your regular lights. IMO, the mechanism doesn't lend its self to doing that. Most cars I've driven turn their regular lights on and off with a twisting motion, making rapid on/off motions awkward.
In every case of flashing lights, it's been pretty easy to tell that they were using high beams...
REALLY old cars, like the ones I drove from the 70s, often had the headlight switch as a knob that you pulled away from the dash to activate. First detent was running lamps, next added low beam headlamps, last position engaged high beam headlamps. To flash, you just yanked that knob all the way out, then pushed all the way back in. To the approaching cars it appeared that all lights in the front came on together, and went off together.
In these modern times, the 'optical horn' is typically a pull on the turn signal stalk which activates the high beam lamps only.
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