>>975842Increase walkability with through-streets and alleys - vehicle access not required so width can be approximately 2 meters. Pathways should extend into surrounding parkland to increase usage and for further expansion. Reduce pedestrian traffic along areas with heavy vehicular traffic, but consider building bridges or tunnels to ease access between the two semicircles.
Circles are not very efficient and are difficult to reclaim for higher density growth, so a grid (or mostly rectilinear layout) would be a better investment.