I know some of these have been said, but for me.
It's when people stay in the fast lane, and don't move over, when they're doing to speed limit.
When people can't maintain their speed. Like today, an older guy, was a car length behind me, then was a 1/4 mile behind me, then was a car length behind me again.
People who don't use there turn signal or leave it on.
People who run red lights. Happened to me twice, so far.
People who leave there Hi-beams on.
People who pull out in front of you, and go slow.
People who decide to pass a vehicle on the freeway, on the fast lane, and they are only going 1 MPH faster than them. Please speed up a little bit, so you're not holding up traffic. You can slow down again, when you're around them.
Semi Drivers, who blast by you when there is a snow storm, kicking up tons of snow, so you can't even see in front of your bumper
People who don't turn on their lights, when it's pretty dark out.
When people who can't seem to stay in their lane, maybe their drunk, or just a bad driver.