Because the safety of motorists on our city streets is a top priority, Westlake Police Department dedicates a special unit to the thorough investigation of vehicular accidents. The Accident Investigation Unit (AIU) is comprised of five police officers trained in motor vehicle accident investigation, three of whom are accident reconstructionists. This unit studies vehicle dynamics, pedestrian accidents, articulated vehicle (motorcycle and semi-truck) accidents, occupant kinematics, vehicular homicide and low-speed impact crashes, among others. The unit responds to all fatal accidents, any accident where the injuries indicate that a fatality is likely to occur, and any other accident where the facts and circumstances indicate that AIU expertise is warranted.