When you park on a hill facing downhill, you should take special precautions so your car doesn’t roll. Turn your front wheels toward the curb (or toward the side of the road if there’s no curb). By doing this, if your vehicle starts to roll, the front tire will bump into the curb and stop the car from rolling forward into traffic. After angling your wheels into the curb, set your parking brake firmly. It’s also a good idea to put the car in the correct gear: if you have an automatic transmission, put it in Park; if you have a manual transmission, you might put it in reverse gear when facing downhill. Let’s say you’re facing downhill on the right side of a street – you would turn your steering wheel to the right, so your right-front tire snugly touches the curb. If there’s no curb, you still turn the wheels to the right (so that if the car rolls, it rolls off the road, not into it). These steps are often part of the driving test because they’re important safety habits. In summary: turn your wheels toward the curb, set the parking brake, and use Park/gear. This way, if the car moves, it will roll into the curb and stop.
