Abstract
The author describes a study undertaken to determine the beneficial effects of road markings on the behaviour of alcohol impaired drivers. If the markings were effective in dealing with the alcohol impaired driver, it seems possible that, since there is some relationship between alcohol impairment and other types of impairment - such as fatigue, driver inexperience, and impaired vision due to age - other types of road accidents could also be reduced. Three basic hypotheses were examined during the study. In almost all cases it was found that the presence of a wider than normal edge line at the edge of the road produced significant improvement in driver performance.