Gravity
The transmission is not in park and/or the parking brake is not applied.
The vehicle should be parked in neutral, with the handbrake on.
It depends on what your needs are. If you are driving you don't need parking brakes, when you are parked your "park" gear should keep you in place but that's not always the case....
Yes, a parking brake system is required regardless of the functionality of the service brakes. The parking brake acts as an additional safety measure to secure the vehicle and prevent unintended movement when it is parked. It is a separate system from the service brakes and must be functional and in good working condition.
Because all cars do this. You need your parking brakes adjusted so it won't move even on a steep hill.
When the car is parked in the location that you want it to be, and the engine is off and the shift placed in Park, pull the parking brake up as far as it will go and leave it there. Remember to release the parking brake before driving away.
It is your fault.
They are never parked on the runway . They park on taxiways designated for parking.
When parked.
A car parked alongside a highway at night should have their parking lights on.
you mean valet parking dont they take away your car if you valet parking on the blue??? ^_^
In the parking hardstands.