Final answer:
When parking a car, the driver should put the car in low gear and set the parking brake to prevent it from rolling away.
Step-by-step explanation:
When parking a car, the driver should put the car in low gear and set the parking brake. This is important to ensure that the car remains stationary and does not roll away. By putting the car in low gear, the transmission is engaged, providing additional resistance and preventing the car from moving. The parking brake adds an extra layer of security, keeping the car in place.