People that cannot stay in their own lane when entering a two lane roadway. People that take their time at green lights. People that do not know right of way rules at a 4 way stop. People who use turn lanes as their own private driving lane. People who enter the turn lane, with the intention of turning a mile down the road. People who stop traffic to let other people enter the roadway from side streets. People who don't drive the speed limit, or are incapable of maintaining a constant speed on highways. People who do not signal their intention to turn or change lanes. People who signal their intention to turn or change lanes a mile in advance. People who can't remember to turn their turn signal off once they have turned or changed lanes. People who engage in activity while driving that, because of said activity, are guilty of any or all of the aforementioned vexations.