What must a driver do after stopping if they have left their driver's compartment?

When a driver stops and exits their vehicle, setting the parking brakes is a critical step to ensure safety. This action prevents the vehicle from rolling unexpectedly, especially on inclined roads. The parking brake secures the vehicle in place, reducing the risk of accidents or injuries to both the driver and any passengers, particularly in situations where the driver may be exiting a large vehicle or a bus.

In various driving scenarios, especially with larger vehicles, there is an increased risk of movement if the driver doesn't take this precaution. Therefore, enforcing the use of parking brakes emphasizes responsibility and diligence in vehicle operation, aligning with safety protocols that assist in maintaining control of the vehicle even after the driver has exited.

While the other actions mentioned are certainly important in different contexts and contribute to overall safety, they do not directly address the immediate necessity to secure the vehicle from unintended movement, making the setting of the parking brakes the most essential action in this scenario.