Abstract
A review is given of some of the more relevant published and unpublished information relating to medical factors in road accidents. It is concluded, both from the review of the literature undertaken and from our own investigations, that the overall rate of incidence of sudden illness in drivers or motorcyclists as a definitive cause of road accidents is low, i.e. of the order of one per 1,000. Conclusions in regard to the relationship between chronic disease or disability and road accidents are more difficult to draw.