If you've been involved in an accident, first try to prevent another accident. Move your vehicle to the side of the road, switch on your four-way flashers, and set out your warning devices. Next, notify the appropriate authorities and request emergency assistance. Until emergency personnel arrive, do what you can to help others. Don't move injured persons unless there is a danger of fire or explosion. Try to keep injured persons from becoming chilled or overheated. If you've been trained in first aid, help the injured. If someone is bleeding, apply pressure to the wound to stop it.