(34)The term “urbanized area” means an area with a population of 50,000 or more designated by the Bureau of the Census, within boundaries to be fixed by responsible State and local officials in cooperation with each other, subject to approval by the Secretary. Such boundaries shall encompass, at a minimum, the entire urbanized area within a State as designated by the Bureau of the Census. (c)It is the sense of Congress that under existing law no part of any sums authorized to be appropriated for expenditure upon any Federal-aid highway which has been apportioned pursuant to the provisions of this title shall be impounded or withheld from obligation, for purposes and projects as provided in this title, by any officer or employee in the executive branch of the Federal Government, except such specific sums as may be determined by the Secretary of the Treasury, after consultation with the Secretary of Transportation, are necessary to be withheld from obligation for specific periods of time to assure that sufficient amounts will be available in the Highway Trust Fund to defray the expenditures which will be required to be made from such fund. (d)No funds authorized to be appropriated from the Highway Trust Fund shall be expended by or on behalf of any Federal department, agency, or instrumentality other than the Federal Highway Administration unless funds for such expenditure are identified and included as a line item in an appropriation Act and are to meet obligations of the United States heretofore or hereafter incurred under this title attributable to the construction of Federal-aid highways or highway planning, research, or development, or as otherwise specifically authorized to be appropriated from the Highway Trust Fund by Federal-aid highway legislation. (e)It is the national policy that to the maximum extent possible the procedures to be utilized by the Secretary and all other affected heads of Federal departments, agencies, and instrumentalities for carrying out this title and any other provision of law relating to the Federal highway programs shall encourage the substantial minimization of paperwork and interagency decision procedures and the best use of available manpower and funds so as to prevent needless duplication and unnecessary delays at all levels of government.