I had a very similar thing happen the other day where, during AM rush hour, a nice woman in the front of a long line of cars, basically, slowed down to, like 5 mph, to allow me to turn left when there was a brief break in the traffic.
I have said here before that at least here in town, even with all the loser-jerks, and they are def out there, I would still say I have 8 or 9 positive encounters for every loser. It is worth mentioning and tipping the hat to these positive folks.