I drive a lot for work, regardless of the commute. Driving that much helps a person put things into perspective. So I slowed down a bit and stopped getting involved in little tete-a-tetes with what my mother always called "the other crazy people out there" (as in, "it's not you I worry about, it's the other crazy people out there"... um... what does that make me?... oh).
Once I started slowing down, I noticed a new unattractive habit popping up. If someone's being a jerk on the road, I don't slam on my brakes in front of them (a brilliant tactic passed down to me from Mom). Even if I want to, I don't stay in front of them just to piss them off and I try very hard to avoid all visible hand gestures. Instead I imagine them getting pulled over by the police... for something completely unrelated to their "crimes" against me. Here's where I am extremely lame:
I picture myself pulling over with them and telling the cop, "You know what else they did?!?"
Still working on achieving adulthood over here.