What do other drivers do that you find very annoying?

I drive a lot. On the highway I drive on regularly, one hundred mile round trip to and from work, if you are not right on top of the person in front of you, someone will cut you off.

Right now I’m on vacation and today, driving on a busy road during rush hour, returning to the resort, all of a sudden the cars in front of me came to a screeching halt. There was an office park and someone was coming out, turning on to the road we were on. The driver in the front of the pack decided to be a nice guy and stop and let the guy coming out of the office park go. That was lovely except we all had to slam on the brakes for his generosity.

What do other drivers do that annoy you?

This question is asked from time to time on Fluther, but I don’t believe it’s been asked in a while.