Lord Bracknell
On fire
Drivers in slow moving traffic who leave a HUGE gap between themselves and the car in front. They have NO IDEA that the effect of this is that they are causing the queue that they are in to TAIL BACK to the junction they've just gone through - effectively CLAGGING UP THAT JUNCTION quite unnecessarily, while at the same time preventing vehicles that are in the queue, but JUST WANT TO REACH THE NEXT LEFT TURN, from getting to the point where they will LEAVE the queue and make things better for EVERYONE.