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both the Federal and State shares of the road building.
Although the word "superhighway" frequently is used in referring to the National Interstate System, the Federal standards for construction, which must be observed if the Federal money is to be obtained,
do not require that this net-^ work be composed entirely of sixlane, or even four -lane, divided highways. Predicted traffic flow in 1975 controls, and two-lane construction will pass the test in some areas. In general, the U. S. Bureau of Public Roads states:
66.5%