Parked on double yellow lines, right near a junction causing an obstruction for other road users. This driver does this regularly & leaves his vehicle unattended for 20-30 minutes.
Constantly parks on the cycle path totally blocking it. Local authority aren't interested and the police will do nothing. They're both as useful as a chocolate teapot!
Pulled out without indicating on the A46 near Cropwell Bishop then repeatedly brake checked me to try and deliberately cause a crash - all because I had the nerve to honk my horn to let him know he'd nearly killed me and my children!
Erratic driving. Driving on wrong side of road at one point. Could have been drunk.