In this image we see a "Superblock" and adjoining cul-de-sac units from the Greenhills development. The Superblock was devised for the Radburn, New Jersey project in the late 1920s. With this concept, all housing faces inward, and surrounds a central greenspace. 
Drawing from Library of Congress


Originally, all pedestrian and vehicular traffic in the three green suburbs was to be separated. This would be done using paved foot paths and pedestrian underpasses, such as this Greenbelt structure, at major roadway intersections. However, building budgets tightened with various cost overruns. A system of pedestrian underpasses was only built in Greenbelt. The "Hills" and "Dale" projects had to settle for guarded crosswalks along their foot path networks.
Photo from Library of Congress / Arthur Rothstein

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