people who just shoot out of side roads without checking to see if any cars are coming
idiots who perform emergency breaks as soon as the traffic lights go amber, even though about three cars behind could have easily got through (and were expecting to do so)
drivers who brake for no reason - e.g. when there's a speed camera there, even though they were driving at snail's pace anyway
slow-coaches driving reaaallly slow and holding up all the traffic
dangerous overtakers - and I feel really indignant and only remember when they're disappearing into the distance that I should have beeped them (not that that would've done any good apart from make me feel better)
seriously, driving gets really stressful sometimes...it takes deep breaths and tasbeeh for me to keep my cool.
careless driving annoys me so much - no matter how much of a careful driver you are, you're always in danger from some nitwit half asleep in his/her carhttp://news.bbc.co.uk/1/hi/england/7878605.stm