Originally Posted by
crazybikerchick
Usually if they are a prick enough to try to run you off the road, then they are going to be even more of a prick when confronted. The exception where it might be useful is for someone who was unaware of you rather than actively aggressively towards you. But still human nature being what it is nobody likes to be confronted

Once, and only once, a driver rolled down their window (without me confronting them first) and said sorry...
I agree with this. There are two kinds of drivers who endanger me. You can talk to the reckless ones but you can't talk to the angry ones. Actually I don't think anything will get through to the angry ones. Even if you find some way to hurt them(keying their car) or to apply leverage (finding out where they live) it will just make them more angry. Then they will beat their kids or something. Psychotic people are psychotic.