You are on a long downhil slope what should you do to help control the speed on your vehicle?

If it is a manual then just pick a lower gear and let the engine help to slow you down using little if any brakes, if it is an automatic, then basically the same thing, you can put it in D if it has over drive, and if not the you can got to 3rd. but listen to the engine and make sure it isn't racing or it is a lost cause, just try not to overdo it with the brakes cause on a long steep slope it will get them hot quick.