What is the proper way to park on a hill facing downhill?

When parking on a hill facing downhill, the proper technique involves turning the wheels toward the curb and setting the parking brake. This action helps to ensure that if the vehicle were to roll, it would roll into the curb rather than down the hill. By turning the wheels toward the curb, the front of the vehicle is angled in such a way that it can catch against the curb, effectively preventing further movement. Additionally, engaging the parking brake further secures the vehicle in place, adding another layer of safety.

In this scenario, other options do not provide the adequate safety measures necessary for parking on a slope. For instance, leaving the vehicle in neutral or only setting the parking brake does not account for the potential of the vehicle rolling downhill, which could lead to accidents. Likewise, turning the wheels away from the curb could actually increase the risk of a rollaway situation if the vehicle were to move, as it would roll towards traffic rather than being contained by the curb. Thus, the combination of turning the wheels toward the curb and setting the parking brake is the recommended and safest practice when parking downhill.