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60 1,000,000 persons. As will be observed, the studies made at 3 cities of 300,000 or more population show that upward of 90 percent of the traffic moving toward these cities on main approach highways consisted of vehicles bound to ultimate or intermediate destinations within the cities themselves. For the 4 cities of 50,000 to 300,000 population, the similar proportion of city-bound traffic was found to be above 80 percent. For the smaller cities, the corresponding proportion tends to decline, reaching 50 percent for the cities of less than 2,500 population that were studied.