Originally Posted by PT Rider
Half or more of the drivers will think that flashing high beams are you giving them permission to proceed.
This is what I immediately thought when reading about people flashing their headlights at cars waiting to turn. I would be very, very careful that your actions are not misinterpreted. (E.G. in the U.K., where I grew up and learned to drive, flashing your headlights at a vehicle that is about to turn does indeed mean, "Alright mate, I see you - go ahead and I'll make sure I leave you enough time/room to make your turn") You never know how someone else will interpret your signalling, far better to slow down a little and ride defensively in this situation, I would think.