Having the police respond to the accident scene is of paramount importance. Make sure that YOU call them and insist that they come and investigate the accident. When the police arrive, they will separate the drivers and witnesses from one another and take statements from everyone involved. Be cooperative, detailed, and firm in describing the accident. The investigating officer will usually determine fault based upon these statements, and it is essential that your version of the events is heard and believed. If you think that you may be injured, make that clear to the officer. If an ambulance or other medical professionals arrive on scene, get checked out. If not, make plans to visit an emergency room or doctor soon after you leave the scene. Before you do leave for this care, the officer will provide you with a report number and their contact information. Make sure this information is safely saved, as it will be very important in any auto accident injury claim you may have.