Forcing RP. If they have no way of getting out of the car, through actions uncontrolled by themselves, they are being forced to RP in a certain way. Thus talking about Point 6 of the Argonath Vision.
If someone feels he/she is being forced to RP either talk with the person that locked him, report to an admin, /kill , /q or just accept it and play along, it can become interesting and funny.