People who leave their blinkers on but, never turn.
People who can't seem to read the MPH sign and go slooow.
People who tailgate when it can't be helped because the person in front is going slow.
People who cut you off.
People who are in such a hurry that they go so far forward in the left turn lane that they go to far and don't hit the signal.
People who stay to far back from the left turn lane that they don't hit the signal.
And a lot of other things that I can't think of now.