When parking a vehicle with automatic transmission on an upgrade, what is proper procedure?

When parking a vehicle with automatic transmission on an upgrade, the proper procedure involves shifting the gearshift into the "P" position, which stands for "Park." Engaging the "Park" setting effectively locks the transmission, preventing the vehicle from rolling backward on the incline. This ensures that the vehicle is securely held in place without relying solely on the brakes.

In addition to shifting to "Park," it's also advisable to engage the parking brake, especially on steeper inclines. This dual approach enhances safety by providing an additional layer of security against unintended movement.

The other choices suggest actions that either do not secure the vehicle effectively or could lead to roll-back, which is dangerous, particularly on slopes. For instance, shifting to neutral does not engage any locking mechanism and could allow the vehicle to roll. Similarly, leaving the vehicle in drive or selecting a lower gear would not prevent movement when parked. Thus, the safest and most effective method is to shift the gearshift into "P" when parking on an upgrade.