Two left blinks? I would hesitate to do any passing as I would always assume the vehicle is still thinking of changing lanes or pulling out to pass. Another minute or two and I might make a cautious move.
Probably the best idea.
The 2-3 blink system was never meant to just jump out and pass without first making the necessary decision to make the pass safely.
Generally we flashed the left turn signal 2-3 blinks to a fellow driver thats following you but hung up behind a slower vehicle.
And we also used the brake light flash to warn that other driver its not safe to pass yet.
And some drivers like the OP mentioned "may" have been trying to be the nice guy and give a OK from his view out front that its ok to pass.....but its entirely up to any driver back there that saw the blinks to pass safely.
