Within the area circumscribed by the interregional circumferential routes, access is provided to the main interregional routes and the circumferential routes at several suburban communities and at certain streets which extend uninterruptedly across the city, and which for that reason are well adapted as internal collectors and distributors of traffic.
The diagrams of figure 31 represent purely imaginary cases. An effort has been made, however, to include in them some of the situations that may be commonly encountered. Study of these diagrams will suggest most of the essential locational relations of the main interregional routes and circumferential and distributing routes, and the difference between circumferential routes that should properly be considered as parts of the interregional system and those that may not be so considered because of their primarily local function.
