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...
To let trucks know it is safe to pull in, I typically flash my headlights as opposed to flashing my high-beams. Less confusion for folks on the other side of the road thinking there is a speed trap going their direction.
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