ACTION signage frozen in time

[smitho]

Over the past week or two, the upstairs urinal at Tuggy Depot has been booked out of use with a chained off barrier around the urinal from which hangs two old ACTION internal bus signs stating "Rear Section Closed" - yellow lettering on a dark blue background. These are the type of sign they used to string across the middle of the bus corridor at night to stop punters entering the back, darkened section of the bus.

Can anyone tell me when was it (roughly) that ACTION stopped closing the rear of buses at night? I can remember it being common occurrence on local routes and only became aware that it was no longer done when I started driving with ACTION....but I suspect the half bus closed policy ended a long time ago.