Originally Posted by DazC

People who use the word 'brought' instead of 'bought'.
People who spell 'his' like hes'.
People who spell 'paid' like 'payed'.
People who spell 'hydraulic' like 'hydrolic'.

Incorrect motorway lane discipline

People who fail to use indicators when moving from the left (lane changing).

Sunday drivers and erratic drivers who cannot maintain a steady speed, more than likely because their head is in the clouds and they're oblivious to whatever is outside their car.