JapanHanuma:
Furthermore the stopbars may in fact have been off to allow for planes and vehicles to cross the runway, and turned on only when the plane was about to land. This would also have not stopped the JCG plane from entering the runway. Many vehicles would not have to obtain permission to cross a runway if they operate on it and stopbars are irrelevant for them when turned off.
Im confused, are you suggesting that airport vehicles sometimes don’t need a clearance to enter or cross a runway?