This is on page 70; a projected plan for an expanded Accra. As you can see, at the heart of the plan is an internal reserve space within a teardrop-shaped block.
Blown up, this is rather difficult to establish as far as projected use is concerned and in fact might almost just be a 'recommended green space of any shape' component:
On page 81, we find amongst the many best-practice examples of Scandinavian planning the following; apartment blocks on narrow lots with occasional prescribed open space areas also regularly allotted. These are not internal reserves but do follow the ideal of regular open space provision for community use. Anyone adapting these principles when planning for single house neighbourhoods would lean towards internal reserve provision...