First things first,lights on overheads the works,safety jackets for your crew,chalk your engine or rescue unit,then flares if needed.Alway's park your engine or rescue unit in front of the accident atleast 25 feet in front of the accident to leave a buffer between you and the scene.call law enforcement for traffic control if needed.NEVER TURN YOUR BACK ON TRAFFIC.The main goal is the safety of your crew and then the safety of others.