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Rh and 7,763 miles of road in the strategic network at total cost of $418,662,500, and for the construction of 1,254 bridges and 12,914 miles of access roads at total cost of $356,104,200.

In terms of total cost the actual improvements of the two classes compare with needs estimated in the 1941 report as follows:

The rates at which these two classes of work were undertaken, in terms of total cost, are shown in figures 6 and 7. The rates of undertaking several classes of access-road projects, varying in the character of the objective area, are shown in figure 8.