Fails to obey signs or signals / pavement markings

Failing to obey signs such as no left turn on red or a stop or yield sign would be a critical error as you could cause a collision. Failing to obey signals such as those on railway crossings or traffic signals would also be a critical error for the same reason. Disobeying pavement marking such as driving in a bicycle lane or making a lane change across a solid line would be considered a major error.