ABSTRACT
Motor vehicle collisions caused by an underlying medical condition are uncommon compared with the usual causes of crashes (i.e., excessive speed for the prevailing conditions and driving while under the influence of alcohol). A study in Arizona identified 614,000 collisions over a 6-year period of which 859 were related to all medical conditions.1 Furthermore, Gresset found that a group of older drivers with chronic disease showed no evidence of an increased odds ratio for crashes from illness.2
