Abstract
In general, phase I of this study found that the physical fitness of older drivers is related to their ability to safely drive an automobile. Older people with higher levels of physical fitness tended to be more proficient at driving than were older people with a lower level of physical fitness. Of the aspects of physical fitness which were measured, joint flexibility and reaction time were found to be most predictive of driving ability. Cardiorespiratory fitness proved to be somewhat less related to driving ability.