You are requested out to County Road 93 for a vehicle collision at a rural area known for serious crashes. After driving with lights and sirens for nearly 20 minutes to reach the scene, you arrive at the intersection at the east end of the county. As you pull up, you see two pickup trucks crushed into a mass of twisted, smoking metal. A sheriff's deputy is shouting and waving you over to the passenger side door of one of the demolished trucks. You quickly look down all four roads leading to the scene and note that they are deserted as far as you can see. How would you ensure the proper control of traffic around this scene?