Abstract
A separate study was performed as part of a major traffic accident causation project to investigate the differences between drivers who caused or increased the severity of accidents and those who were innocently involved. Statistical tests were employed to evaluate age, driving experience, vehicle familiarity, road area familiarity, and driving exposure differences between male and female at fault and innocent accident-involved drivers. Procedures for controlling measurements of driving experience, exposure, and vehicle familiarity for the effects of driver age and sex are discussed.