First of all, nobody is trapped - that sounds a bit sensationalist to be honest. They were delayed, the same way cars are delayed down residential side streets because there's parking on both sides and the bin lorry takes up the whole middle of the road.
Secondly we've made a proposal to remove those parking spaces widen the entrance and exit based on listening to feedback that was provided as part of the trial.
Thirdly, if the proposal were to be implemented, (and the council removed the defunct toilet) then there would be plenty of space for the bin lorry to be out of the way - even as your photo shows, you'd be able to exit AND enter passing the bin lorry without those cars parked there.
Yes without planters as you say, they could exit the old way too, but as shown with the existing layout, no-one could enter at all which causes the delays and backups onto the SCirc that everyone has commented on.
So yes indeed, our proposal seems to make sense to even alleviate exiting issues that you've raised here, so this is great feedback. Thanks.