What should drivers use if they must leave their vehicles unattended?

Using parking brakes is essential when leaving a vehicle unattended because it helps ensure that the vehicle remains stationary and does not roll away. Engaging the parking brake secures the vehicle in place, especially in areas where there may be a slope or uneven ground. This safety measure is crucial for preventing accidents or injuries that could occur if a vehicle were to move unexpectedly.

While emergency lights and hazard lights serve important functions in alerting other drivers to a potential hazard or that a vehicle is stopped, they do not provide physical restraint to the vehicle itself. Similarly, warning flags are usually used to signal an obstruction or hazard ahead and do not assist in securing an unattended vehicle. Therefore, activating the parking brakes is the most effective and appropriate action to take when a driver must temporarily leave a vehicle unattended.