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It is evident that a large part of the more heavily traveled mileage of the system and all of the most heavily traveled sections lie within relatively narrow zones circumscribed about the cities of 10,000 or more population. As a further generalization, it may be added that much of the remaining more heavily traveled mileage is located closely contiguous to such zones. Obviously, the heavier travel of these sections is generated largely by local movements in and out of the central cities.