Which secure-parking practice does the Michigan handbook recommend after you position the vehicle?

Correct answer: Set the parking brake instead of relying only on the transmission.

Why

Set the parking brake as an additional way to hold the vehicle instead of relying only on the transmission. The unattended-vehicle statute requires the parking brake effectively set or the transmission in Park, plus stopping the motor and removing the ignition key, subject to its remote-activation exception. On a grade, position the wheels to keep a roll toward the curb or side rather than traffic. The handbook's parking-brake recommendation is a safety practice even where Park satisfies that part of the statute.

Verified against What Every Driver Must Know · Securing a parked vehicle · p. 51