Ooh, I've got another er... three.... maybe more if they appear in my head by the time I've finished typing
Drivers who sit on the tail of someone in the middle lane of a motorway, then overtake and then pull back in sharply - all the way to the slow lane, as if to say "THIS is where you should be driving". I saw some bloke in an Audi do it to someone on the M4 today. Some people drive in the middle lane - get over it. If you want to overtake, use the overtaking lane and get on with your journey.
Often the same person as the above, are the slowest-lane-huggers who change lane every few seconds, whilst still going faster than the bulk of the traffic, seemingly determined to keep in the leftmost lane possible, like it was some kind of automotive game of horizontal Tetris. No... you're not a good driver like you obviously think you are, you're a bloody danger with your mad weaving.
Lorries who think that a millisecond flash of the indicator before suddenly slewing 38 tonnes in front of you is acceptable. Actually, they don't give a shit what's 'acceptable' - they just know they're a fuckload bigger than you and you are going to yield - always.
Women - and it genuinely pains me to say this, but it is
almost exclusively women, who sit in the fast lane utterly oblivious to the twenty car queue behind them, not once thinking to look the in the rear view mirror (if they haven't moved it around to look at themselves better - don't moan, it's true... I've lost count of the number of women drivers I've been behind where the mirror is twisted around to aid with the lippy etc) - or - if they
do look in the mirror, fail to register that perhaps those twenty cars might like to get past. I think a lot of this is down to low confidence and the logic in picking a lane to drive in that has the least number of obstructions ahead. The fact that it's the overtaking lane doesn't seem to click as important