I haven't seen it before, thanks Rebbonk
Would be interesting to know which particular section of the Ring Road this was?
http://www.macearchive.org/Media.html?Title=3469There were only two sections at the time; Ringway St John and Ringway St Nicholas. Note that originally it was to be a dual carriageway with cycle lanes. The whole project was then abandoned and the route resurveyed to take account of modern traffic conditions.
Update: the section of Ring Road has now been positively identified from public transport records as Ringway St John.
Here's a great idea: a "toddlers" play area on the roof of a 17 storey building
http://www.macearchive.org/Media.html?Title=7581