People at traffic lights who cross the line when their exit is not clear. "But it was on green!" Yes it was, but this is rush hour and the lights a couple of hundred yards further on are on red and there's so much traffic that it's backed up to the set you're at. So now you're in the middle of the crossroads, my lights are on green and you're blocking my path! I can't move and the dick three cars back who can't see what's going on is leaning on his horn with steam coming out of his ears because the lights are green and nobodys' moving!

People who won't get their arses out of bed early enough to wake up fully, have a proper breakfast and then drive to work in an alert and sensible fashion, having given themselves ample time to get there.