The administration of the law is in the hands of the Office of Public Roads. The entire country is divided into ten districts, over each of which is a district engineer. When a state desires aid from the national government, its highway department must draw up plans for the improvements proposed and submit them to the district engineer, who in turn submits them with recommendations to the Secretary of Agriculture, whose approval they must have. Having obtained this approval, the work is carried on by the state as in the case of other roads entirely under state control.

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