What is the correct gear position for an automatic transmission vehicle parked on a downgrade?

When parking an automatic transmission vehicle on a downgrade, the correct gear position is "P," which stands for "Park." This gear locks the transmission, preventing the vehicle from rolling. When the vehicle is parked, it is essential to engage the parking brake in addition to putting the transmission in the "P" position to ensure maximum stability and security.

Choosing "P" is crucial when parked on an incline or decline because it provides a mechanical lock that holds the vehicle in place. If the transmission is left in "N" (Neutral), it does not engage any gears, allowing the vehicle to potentially roll down the slope. Similarly, "R" (Reverse) and "D" (Drive) are not suitable for parking, as "R" would imply the vehicle is ready to move backwards, and "D" is for driving forward, which is not appropriate when the vehicle is stationary.

In summary, using the "P" position when parked on a downgrade is key to ensuring the vehicle remains securely in place and is a best practice for safety.