In hill parking, why is setting the parking brake recommended in addition to wheel turning?

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When you’re parked on a hill, relying only on the transmission to hold the car isn’t enough because gravity can start the car moving if the brakes don’t hold perfectly. Engaging the parking brake activates a separate braking system that clamps the wheels and provides a strong, primary hold independent of the engine or transmission. Turning the wheels toward the curb adds a helpful safeguard: if the car tries to roll, the wheel will press against the curb and act like a wedge, helping to stop or slow any movement. Together, these steps keep the vehicle stationary on slopes and reduce the strain on the drivetrain, making hill parking safer.