The study was conducted to measure variables related to safe driving and to designate factors predictive of success in driving safety of educable mentally retarded (EMR) students as compared to normal students. Subjects were 349 EMR and 443 intellectually normal students (ages 16-20), who were evaluated in the following areas: visual acuity, visual organization, field of vision, depth perception, eye-hand coordination, class in school, residence, father's occupation, reaction time, and emotional maturity. Driving records (accidents and violations) were compared to test results. Findings showed the following factors related to accident and violation rate: age (for normals), weight (for normals and female EMRs), class in school (for both groups), city or suburban residence (for both groups), and higher skill level of father (for female EMRs and normals). Wearing of glasses for female EMRs was related to not having accidents; handedness was unrelated for both groups. Also reported were the relationship of the scores of the various tests administered to driving records. Scores related to having accidents were high visual acuity, low distance judgment (for EMRs), high field of vision, not having had Driver Education (for EMRs), and having had Driver Education (for female normals). (KW)