A separate study was performed as part of a major traffic accident causation project to investigate the relationships between driver/vehicle characteristics and vehicle condition and causation, and to evaluate the effectiveness of Indiana PMVI. Results indicate that the condition of accident-involved vehicles was significantly related to a number of driver/ vehicle characteristics including driver age and education, and vehicle age and manufacturer. The likelihood of vehicular causal involvement in accidents was related to driver age and vehicle age. Concerning PMVI effectiveness, of the components which were judged to be causally implicated in the accidents investigated, 51.7% were either not manditorily inspected through Indiana PMVI or if inspected were judged to have been in a failing condition at the time of the state inspection.