The Accident Investigation Unit includes officers and supervisors who have specialized training in traffic collision reconstruction, traffic engineering, automotive engineering and vehicle dynamics. The Accident Investigation Unit conducts detailed investigations and analyses of major traffic collisions throughout the city. Investigations include the reconstruction of a collision and a study of the factors that may have contributed to the incident. These factors include, but are not limited to, environmental, human and mechanical causes, and are associated with the three phases of a collision (pre-crash, at-crash and post-crash). Through utilization of these tools, the ultimate goal of the Accident Investigation Unit is to prevent the occurrence of similar collisions.