The Age Differences in Estimating Speed of Drivers' Own

This study focused on estimating speed of drivers' own. The aim of this study is to investigate the age differences in accuracy of estimating speed. Participants were 61 drivers: 20 young (aged 20–39 years), 19 middle-aged (40–59 years), and 22 older drivers (60+ years). The participants watched each of two driving scenarios, showing either a guardrail-equipped or a concrete median. The participants were asked to push a button when they perceived speeds of 60 km/h. The accuracy of estimating speed was estimated by the square of variance; which take 60(target speed) from response speed. The result of two-way analysis of variance showed a main effect of age and an interaction effect of age and median. The accuracy of estimating speed was the highest in middle-age group in both guardrail and concrete conditions. The accuracy in young drivers was the lowest in guardrail condition. In concrete condition, it was the lowest to the accuracy of speed estimating of older drivers.