Happens more & more despite my resolve to always wait them out! I usually make a circular, rolling wheel, motion with my hand while I wait for them to move on. Usually works & I give them a wave of thanks once they drive past. On my ride today I was sitting at a stop sign, waiting for a break in the cross traffic so I could ride across this 2 lane, one way street & a young guy starts coming to a stop for me. Almost had a chain reaction pile up as several cars skidded behind him before he drove on. No way would I have gone out in front of the guy, worth your life.