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Rh to retain such costs in a separate account whereas others include a substantial proportion in the construction and maintenance accounts. In either event, the administrative costs, as herein summarized, represent the net amount of such costs not elsewhere included.

Table 6 shows, by system, the amounts of the administrative costs as determined from the States’ estimates, for the initial 10-year period 1955–64, and for the following 20-year period 1965–84.

TOTAL NEEDS

Figure 4 shows the total highway needs for each 5-year period, starting from 1955, to the end of 1984. Portions of each bar representing construction are the same as the total heights of bars in figure 3. The amounts for maintenance and administration are shown in addition. The first 2 bars represent the 10-year needs total of $126.1 billion, consisting of $100.8 billion for construction, $19.4 billion for maintenance, and $5.9 billion for administration. The remaining 4 bars represent additional needs for these 3 purposes from 1965 to 1984: The $171.0 billion total for the 20-year period consists of $114.4 billion for construction, $48.8 billion for maintenance, and $7.8 billion for administration.

The total estimated needs for the entire 30-year period from 1955 to 1984, then, amount to $297.1 billion, of which 72 percent is for construction, 23 percent for maintenance, and 5 percent for administration.

Over the 30-year period the total needs average out to $9.9 billion a year. By way of comparison, the estimated total expenditure (exclusive of debt service) for all roads and streets in 1954 was $6.1 billion, of which 64 percent was for construction.

FINANCING THE HIGHWAY NEEDS

The cost of bringing the Nation’s roads and ts to adequacy in 10 years has been estimated at $100.8 billion. If the present rates of taxation of motor fuel are continued and the present structures of