Full-scale crash tests involving roadside safety hardware utilize the flail space model and Acceleration Severity Index (ASI) injury criteria to assess the potential for occupant injury. Little is known, however, regarding the correlation of these criteria to actual occupant injury. Event Data Recorders (EDRs) are a new technology capable of recording vehicle kinematics during a collision. Using EDR data, the effectiveness of the flail space model and ASI are compared in terms of maximum injury, head injury and thoracic/abdominal injury.