there are many things, but i hate when the traffic light turns green and no one moves. I also hate it when people pull out in front of you like they're in a hurry and drive slow once in front of you. and on the freeway, when people can't make up their minds what speed they want to go, you pass them, then they're passing you, then they slow down and you pass them again....so on and so on. I drove a cargo van expediting for two years, i get easily pissed with people on the road.....lol! I could go on, but i won't!