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Gravity, parking on an incline
When parked on an incline, gravity pulls the vehicle downhill.
To keep your vehicle from rolling away, you should leave your vehicle in a low gear, or in “Park” if it has an automatic transmission. You should always engage your parking brake and may even need to block the wheels by placing an object in front of the tires when facing downhill or behind the tires when facing uphill.
Just in case your parking brake fails, you should always turn the front wheels of your vehicle so that it will not roll into traffic.
The way you should turn your wheels depends on whether you are parked facing uphill or downhill and whether or not there is a curb.
If you are parking facing downhill, you should always turn your front wheels toward the curb or the side of the road.
If you are parking facing uphill and there is a curb, you should turn your front wheels toward the middle of the road (left) and allow the vehicle to roll back against the curb. If you are parking facing uphill and there is not a curb, you should turn your wheels (right) toward the side of the road.
The easiest way to remember which way to turn the wheels is; up hill, with a curb, left, all other times right.