A study of the North Carolina Driver Medical Evaluation Program was undertaken to assess the effects of the program upon objective measures of the driving task. The study group was formed of 4,117 subjects who were medically evaluated and submitted to a system of restraints imposed upon their operation of motor vehicles during the two-year period from September 1, 1968 through August 31, 1970. Accidents and selected violations compiled from the official driving record were collected over a year's time in both retrospective and prospective periods relative to the subject's induction into the evaluation process. Driving performance was examined for each class of restriction and from every stage of the medical evaluation process. Comparisons were made within the experimental groups and against a random sample from the general driving population.

The data suggest a consistent measure of improvement in driving performance for medically evaluated subjects.