What happens if a vehicle is parked on a steep incline?

When a vehicle is parked on a steep incline, the primary concern is safety. If the vehicle is not properly secured, it can indeed roll away due to the force of gravity acting on it. This scenario is hazardous not only for the vehicle itself but also for other road users, as a rolling vehicle can cause accidents or injuries.

To prevent such incidents, drivers should always use the parking brake when leaving a vehicle on an incline. Additionally, turning the front wheels towards the curb (if facing downhill) or away from the curb (if facing uphill) can help keep the vehicle in place should the parking brake fail. Understanding this principle is critical for ensuring the safety of both the vehicle and others on the road.

The other options do not address the significant safety risk posed by inadequate securing of a vehicle on an incline, making the correct answer focused on the potential for the vehicle to roll away if not properly secured.