One possible version:
If there has been a traffic accident, we should first make sure that the accident scene is safe so that we won't get hurt. We should ask the injured person if he or she is OK, and see if the injured person is breathing. If not,we must try to start his or her breathing. Next, we should check for cuts and wounds. If he or she is bleeding, we should try to stop the bleeding by using proper methods. Do remember: when giving first aid, please place the person in a recovery position.