Evaluation of Threshold Values of Acceleration Severity Index by Using Event Data Recorder Technology (05-2220)
Douglas John Gabauer, Bucknell University
Hampton Clay Gabler, Virginia Polytechnic Institute and State University

The Acceleration Severity Index (ASI) is used to evaluate the potential for occupant risk in full-scale crash tests involving roadside safety hardware. Despite its widespread use across Europe, there is a lack of research relating this metric to occupant injury in real-world collisions. Recent installation of Event Data Recorders (EDRs) in a number of late model vehicles presents a different perspective on the assessment of the validity of occupant risk based on the Acceleration Severity Index. EDRs are capable of electronically recording data such as vehicle speed, brake status and throttle position just prior to and during an accident. Of particular interest is the EDRs ability to document the deceleration of a vehicle during a collision event. This paper utilizes EDR technology to investigate the correlation between the ASI threshold limits and the potential for occupant injury in crash events. The longitudinal ASI is found to be a good predictor of overall injury and the intent of the current recommended threshold value of 1.0 appears valid. Limitations include investigation of the longitudinal direction only, lack of injuries in excess of AIS 3, and no control for occupant compartment intrusion.