Which bad driving habits really annoy you?

http://www.theguardian.com/commentisfree/2014/jul/22/bad-driving-habits-motorists-hard-shoulder

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A driver pulled over on to the hard shoulder of the motorway because he thought his car was on fire. In fact, he had seen the word “fire” on his radio screen, and panicked. The message was actually highlighting the name of the song (by Adele) that he was listening to.

This is just one of many ridiculous reasons given to Highways Agency traffic officers when asked why they had stopped on the hard shoulder. The list also included a motorist who puller over to renew their car insurance, and a group of bikers who stopped to have a drink.

Have you ever participated in a driving transgression? Have you gone round a roundabout the wrong way, or driven at two miles an hour because you were desperately trying to read a map? Have you always been a perfect driver but have witnessed some astonishingly stupid decisions made by others? Tell us the worst examples of motoring that you’ve seen or been a part of.