Five of ARCCA’s engineers recently conducted a training session for the Puget Sound Special Investigators focusing on human kinematics during a motor vehicle collision. Amanda Stone, Ph.D., presented on the basics of accident reconstruction, occupant kinematics during different collision configurations, and the various protection systems in place throughout the vehicle. Brendan Morse, P.E., M.S., C.H.F.P., ACTAR, Wade Lanning, Ph.D., Ian Grissom, B.S., ACTAR, and Brad Probst, M.S., then conducted a live practical demonstration of three vehicle collisions. Two vehicles, one with an anthropomorphic test device (ATD) positioned in the front seat, were collided in different configurations to investigate the effect impact direction and protection devices have on occupant motion. The collisions were memorialized with accelerometers positioned inside the vehicle and high-speed cameras positioned around the area. Afterwards, the findings were discussed in a townhall-style meeting between our engineers and the training attendees.