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4 from both the Bureau’s regional offices in the field and the headquarters office in Washington worked closely with the State and division office personnel in the preparation of the estimate. This procedure provided the close supervision necessary for a high level of uniformity.

Each State has compiled its estimate in a bound volume following a standard format for all States which includes maps showing the location of the several interstate routes in that State, plates showing the engineering features, and tables listing the design criteria, route and section mileages, and estimated costs for each section broken down into major elements of construction.

On June 29, 1956, when the 1956 act was approved, sections of the Interstate System were in various stages of development, ranging from the most elemental preliminary planning upward through completed sections already in use. In estimating the cost of completing the Interstate System in accordance with the adopted geometric an construction standards, all work in a financed status as of July 1, 1956, was considered as having been completed. This means that the cost of any work on the Interstate System, which was to be accomplished with funds already assigned for construction, has not been included in this estimate.

It was also necessary to insure the use of a common base period for the unit construction prices to be used in the estimate. Since all of the States would be working on their estimates in the early part of the calendar year of 1957, average cost indexes of construction for the last half of the calendar year of 1956 were selected.

On completion of each State’s estimate, it was forwarded through the field offices of the Bureau of Public Roads and then to the Washington office where detailed checks, analyses, and summaries of the States’ estimates have been made.

COST SUMMARIES AND APPORTIONMENT FACTORS

The data summarized in the following tables are derived from material presented in the 49 volumes of the reports.

Table B lists by States (1) the amounts of the unobligated balances as of July 1, 1956, of the Federal-aid interstate funds apportioned for the fiscal years 1954-57, inclusive, under the Federal-Aid Highway Acts of 1952 and 1954 with corresponding amounts of estimated State matching funds, (2) the amounts of interstate funds apportioned since July 1, 1956, for the fiscal years 1957-59, inclusive, under the Federal-Aid Highway Act of 1956 with corresponding amounts of estimated State matching funds, and (3) amounts for work expected to be financed with other than interstate and State matching funds. In order to comply with the intent of the 1956 act these amounts have been excluded from the cost figures to be used in establishing the factors for apportionment of funds authorized for the 1960 and later fiscal years.

Table C lists the estimates of cost by States for all work not financed as of July 1, 1956, which was required to complete the Interstate System. These costs are shown in three categories: (1) Preliminary engineering, (2) right-of-way, and (3) construction. The summation of the cost of these three elements of work less the total amounts