Then, why do you ask the question in the first place???
You already know the answer, and even if we give you the right answer, you'll just say that we Googled it. I DO know the answer, but to reveal it would label me a loser and an ugly person. This is a waste of time and a no-win situation.
If you are pulling off the side of the road, first turn on your signal so people behind you will know. Once you are off the road turn on your hazards. so traffic will see that there is someone in the vehicel and they should slow down a proceed with caution.