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2 for the routes already designated, their previously estimated length would be reduced to approximately 38,548 miles.

On October 18, 1957, the Secretary of Commerce announced 2,102 miles of interstate routes expected to be added to the system. None of the cost of this mileage is included in the present estimate. The 1,000-mile expansion of the system is specifically excluded by section 108 (1) of the 1956 act, and the 1,102 miles of the savings made possible as a result of more direct locations became available subsequent to July 1, 1956, which is used as the base date for preparation of the cost estimate in this report.

Plate A shows the location of the designated routes which form the basis of this estimate. Table A shows the mileage of the Interstate System as well as the mileage of the other Federal-aid highway systems in each of the States.