Another data point. I was stopped at a red light behind a small truck (electrician IIRC), I was DIRECTLY behind, and he decided he needed to turn at the light so he put it in reverse and backed into me, despite my horn blaring at him. I was in a hurry, on my way to the airport, but I figured they'd try to say I rear-ended him, so I got the driver to sign a statement that he had reversed into me. Not surprisingly his insurance company tried to get out of it, so I just sent them a copy of his letter.