Make sure to check your surroundings before exiting your car, as other drivers might be too busy looking at the crash to see you standing next to your car. If you or any other participants are injured, call 911 immediately. If you or another person is unsure if they are injured, call 911 anyways. If possible, snap a quick picture of the accident scene and then move the cars to the side of the road. If the cars are undriveable or if there are injuries, leave the cars where they are and call 911. Try to move any people to the sidewalk or shoulder.