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It is, therefore, concluded that the recommended system closely approximates the system of optimum extent from the standpoint of service to manufacturing industry.

Location in relation to agricultural production.—It has previously been shown that the recommended system traverses 1,056, or 34.3 percent, of the 3,076^[1] counties of the United States and that the counties traversed include the places of residence of 45.2 percent of the total rural population of the country. On further examination it is found that the counties traversed account for 43.3 percent of the total value of all farm products sold or traded in the Nation as a whole. Per county, the average value of marketed products in the counties traversed is 46 percent higher than in the remaining more numerous counties.

Figure 8.—The number of cities of more than 10,000 population directly connected by various highway systems investigated and the values added by manufacture in such cities, expressed as percentages of the one number of cities of more than 10,000 population and the total value added by manufacture in all such cities.

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1. See footnote 3.

93800—44——_3