Sensorimotor and postural control factors associated with driving safety in a community-dwelling older driver population

Background: To establish whether sensorimotor function and balance are associated with on-road driving performance in older adults. Methods: The performance of 270 community-living adults aged 70-88 years recruited via the electoral roll was measured on a battery of peripheral sensation, strength, fexibility, reaction time, and balance tests and on a standardized measure of on-road driving performance. Results: Forty-seven participants (17.4%) were classifed as unsafe based on their driving assessment. Unsafe driving was associated with reduced peripheral sensation, lower limb weakness, reduced neck range of motion, slow reaction time, and poor balance in univariate analyses. Multivariate logistic regression analysis identifed poor vibration sensitivity, reduced quadriceps strength, and increased sway on a foam surface with eyes closed as significant and independent risk factors for unsafe driving. These variables classifed participants into safe and unsafe drivers with a sensitivity of 74% and specificity of 70%. Conclusions: A number of sensorimotor and balance measures were associated with driver safety and the multivariate model comprising measures of sensation, strength, and balance was highly predictive of unsafe driving in this sample. These fndings highlight important determinants of driver safety and may assist in developing efficacious driver safety strategies for older drivers.