People who dogmatically refuse to pause for just a few seconds to allow a stationary vehicle to turn right across you.  There's invariably a long line of traffic who can't get past him.   I've had grateful drivers twelve cars behind him flash their lights and give me a thumbs up in grattitude, but to me it's no big thing - it's not even courtesy.  It's just straight common sense.  The same as a line of cars trying to come out of a side road.  If just one car in five lets one person out, there'd be no queue at all, and is four seconds really going to delay you?

.  Read the road:  If there are a set of traffic lights on green two hundred yards ahead, slow DOWN.  That's right.  You know full well they're going to turn red by the time  you're seventy feet from them, so why waste petrol approaching them at 35mph knowing that you face a three minute wait?  I'm one of these people who are happy to be stuck in trafficfive cars back, because I know the next time the lights turn green, I'm through.