Ultrasonic, capacitive, and infrared (IR) occupant position sensors were tested to determine their compatibility with crash test dummies. In this phase of testing, the sensors' responses to a Hybrid III 50th percentile male crash test dummy were compared to those of a human male of similar size. After the data were compared, crash test dummy modifications were developed so that sensor responses to the dummies more closely resembled their responses to humans. Ultrasonic sensors detected little difference between the dummy and the human. However, testing of capacitive and infrared sensors revealed differences in their responses to a crash test dummy and a human subject.