Driving at very high speed (100mph +) on country roads after overtaking me after some aggressive tailgating, then continuing to drive on the wrong side (not sure why- think they may have been on the phone- it did look like it when they were tailgating). Caught up with this person at a junction further ahead, then saw them overtake 6 cars before a bend, just missing an oncoming car. Nuts.
Dangerous middle lane driver. As a emergency vehicle (police) approached they did not move into the empty left hand lane, creating danger for everyone as they squashed in. As the emergency vehicle pass they continued to be in the middle lane for 8 miles!
Driver on phone and not paying attention to lane markings on the roundabout. Nearly side swiped us into the centre of roundabout.