Abstract
This report addresses the effects of medical conditions and medications on the ability to operate a motor vehicle safely. It presents crash rates and crash odds ratios for broadly defined groups of drivers known to the Department of Motor Vehicles as having physical or mental conditions that potentially impair driving. It also reviews the scientific literature dealing with medical conditions and driving. Finally, the report briefly discusses a tiered assessment system under study by the department that holds promise for identifying and evaluating medically impaired drivers. (A)