I was driving to work this morning in middling to heavy rain and the driver in front decided to put on his fog lights...because of the rain. It;s one thing that really annoys me - people using fog lights because it is raining (they're only supposed to be used in fog, and then only when visibility is significantly reduced - and putting them on doesn't meant it is safe to drive at the susal speed!). So what annoys you when driving? A couple of others of mine: Not using part-time bus lanes when they aren't in operation. Failing to indicate. Indicating right at a roundabout when going straight ahead.