IMO the council and the adjudicator are wrong, but that's the luck of the draw. Firstly to be considered a road within the terms of the legislation the public must have unfettered access and if the cannot take a vehicle then that is not the case
Can you point us to case law or legislation on this point? I cannot find the term 'unfettered' anywhere.
There are No Entry signs, with associated plate, which have no legal effect unless it is a road. IMO, it's a road restricted to buses, but IMO it's still a road.