Always use your RV’s turn signals when you move through or out of traffic. In an emergency, and once you are on the side of the road, use emergency flashers, flares, or some other emergency signaling device to warn oncoming traffic.
Emergency signaling devices are even more important if you are unable to pull completely off the road away from the flow of traffic.
If a narrow shoulder does not permit your RV to be parked far enough away from traffic flow or you are on the top of a hill or around a curve in the road and oncoming drivers cannot see you, proper use of emergency signaling devices and a person flagging traffic away from the scene are important safety precautions.