Whenever the Secretary of Transportation shall find and determine, and such finding and determination shall be approved by the President of the United States, that the national policy declared in section
1101 of this Appendix, and the objectives set forth in section
1120 of this Appendix, cannot be fully realized within a reasonable time, in whole or in part, under the provisions of subchapters V and VI of this chapter, the Secretary of Transportation is authorized and directed to complete his long-range program previously adopted as provided in this subchapter.