It may be a generational thing, but doesn't the quick double flash imply that someone is running radar behind the flasher (ie up ahead for the flashee)? Ever see anyone's brake lights come on as they pass, following flashing? Could get confusing...
Come to think of it, I don't see people do that anywhere near as often as I used to. It would be a shame for the custom to disappear---it's saved me on a number of occasions.
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