and desirable weight and size standards for vehicles using the public highways and of the feasibility of uniformity in State regulations with respect to such standards and he shall report from time to time to the Committees on Public Works of the Senate and of the House of Representatives on the progress and findings with respect to such studies.

(c) (1) Not to exceed 12 per centum of the sums apportioned for each fiscal year prior to the fiscal year 1964 to any State under section 104 of this title shall be available for expenditure upon request of the State highway department, with the approval of the Secretary, with or without State funds, for engineering and economic surveys and investigations; for the planning of future highway programs and the financing thereof; for studies of the economy, safety, and convenience of highway usage and the desirable regulation and equitable taxation thereof; and for research and development, necessary in connection with the planning, design, construction, and maintenance of highways and highway systems, and the regulation and taxation of their use.64 (2) One and one-half per centum of the sums apportioned for each fiscal year beginning with the fiscal year 1964 to any State under section 104 of this title shall be available for expenditure by the State highway department only for the purposes enumerated in paragraph (1) of this subsection.

(3) In addition to the percentage provided in paragraph (2) of this subsection, not to exceed one-half of one per centum of sums apportioned for each fiscal year beginning with the fiscal year 1964 under paragraphs (1), (2), and (3) of section 104 (b) of this title shall be available for expenditure upon request of the State highway department for the purposes enumerated in paragraph (1) of this subsection.

(4) Sums made available under paragraphs (2) and (3) of this subsection shall be matched by the State in accordance with section 120 of this title unless the Secretary determines that the interests of the Federal-aid highway program would be best served without such matching.65

Sec. 308. Cooperation with Federal and State agencies and foreign countries

(a) The Secretary is authorized to perform by contract or otherwise, authorized engineering or other services in connection with the survey, construction, maintenance, or improvement of highways for other Government agencies, cooperating foreign countries, and State cooperating agencies, and reimbursement for such services, which may include depreciation on engineering and roadbuilding equipment used, shall be credited to the appropriation concerned.

(b) Appropriations for the work of the Bureau of Public Roads shall be available for the expenses of warehouse maintenance and the procurement, care, and handling of supplies, materials, and equipment for distribution to projects under the supervision of the Bureau of Public roads, or for sale or distribution to other Government agencies, cooperating foreign countries, and State cooperating agencies, and the cost of such supplies and materials or the value of such equipment, including the cost of transportation and handling, may be reimbursed to current applicable appropriations.

64 Amended by sec. 6 of Public Law 88-157, Oct. 24, 1963 (77 Stat. 276). 65 Amended by sec. 11 of Public Law 87-866, Oct. 23, 1962 (76 Stat. 1145).

Sec. 309. Cooperation with other American Republics

The President is authorized to utilize the services of the Bureau of Public Roads in fulfilling the obligations of the United States under the Convention on the Pan-American Highway between the United States and Other American Republics (51 Stat. 152), cooperating with several governments, members of the Organization of American States, in connection with the survey and construction of the InterAmerican Highway, and for performing engineering service in the other American Republics for and upon the request of any agency or governmental corporation of the United States. To the extent authorized in appropriation acts, administrative funds available in accordance with subsection (a) of section 104 of this title shall be available annually for the purpose of this section.

Sec. 310. Civil defense

In order to assure that adequate consideration is given to civil defense aspects in the planning and construction of highways constructed or reconstructed with the aid of Federal funds, the Secretary of Commerce is authorized and directed to consult, from time to time, with the Federal Civil Defense Administrator relative to the civil defense aspects of highways so constructed or reconstructed. Sec. 311. Highway improvements strategically important to the national defense

Funds made available under subsection (a) of section 104 of this title may be used to pay the entire engineering costs of the surveys, plans, specifications, estimates, and supervision of construction of projects for such urgent improvements of highways strategically important from the standpoint of the national defense as may be undertaken on the order of the Secretary and as the result of request of the Secretary of Defense or such other official as the President may designate. With the consent of a State, funds made available under subsection (b) of section 104 of this title may be used to the extent deemed necessary and advisable by the Secretary to carry out the provisions of this section.

Sec. 312. Detail of Army, Navy, and Air Force officers

The Secretary of Defense, upon request of the Secretary, is authorized to make temporary details to the Bureau of Public Roads of officers of the Army, the Navy, and the Air Force, without additional compensation, for technical advice and for consultation regarding highway needs for the national defense. Travel and subsistence expenses of officers so detailed shall be paid from appropriations available to the Department of Commerce on the same basis as authorized by law and by regulations of the Department of Defense for such officers.

Sec. 313. Highway Safety Conference

The Secretary is authorized and directed to assist in carrying out the action program of the President on highway safety, and to cooperate with the State highway departments and other agencies in this program to advance the cause of safety on highways. Not to

exceed $150,000 out of the administrative funds made available in accordance with subsection (a) of section 104 of this title may be expended annually for the purposes of this section.

Sec. 314. Relief of employees in hazardous work

The Secretary is authorized in an emergency to use appropriations to the Department of Commerce for carrying out the provisions of this title for medical supplies, services, and other assistance necessary for the immediate relief of employees of the Bureau of Public Roads engaged in hazardous work.

Sec. 315. Rules, regulations, and recommendations

Except as provided in sections 204(d), 205 (a), 206(b), 207 (b), and 208 (c) of this title, the Secretary is authorized to prescribe and promulgate all needful rules and regulations for the carrying out of the provisions of this title. The Secretary may make such recommendations to the Congress and State highway departments as he deems necessary for preserving and protecting the highways and insuring the safety of traffic thereon.

Sec. 316. Consent by United States to conveyance of property

For the purposes of this title the consent of the United States is given to any railroad or canal company to convey to the State highway department of any State, or its nominee, any part of its right-ofway or other property in that State acquired by grant from the United States.

Sec. 317. Appropriation for highway purposes of lands or interests in lands owned by the United States

(a) If the Secretary determines that any part of the lands or interests in lands owned by the United States is reasonably necessary for the right-of-way of any highway, or as a source of materials for the construction or maintenance of any such highway adjacent to such lands or interests in lands, the Secretary shall file with the Secretary of the Department supervising the administration of such lands or interests in lands a map showing the portion of such lands or interests in lands which it is desired to appropriate.

(b) If within a period of four months after such filing, the Secretary of such Department shall not have certified to the Secretary that the proposed appropriation of such land or material is contrary to the public interest or inconsistent with the purposes for which such land or materials have been reserved, or shall have agreed to the appropriation and transfer under conditions which he deems necessary for the adequate protection and utilization of the reserve, then such land and materials may be appropriated and transferred to the State highway department, or its nominee, for such purposes and subject to the conditions so specified.

(c) If at any time the need for any such lands or materials for such purposes shall no longer exist, notice of the fact shall be given by the State highway department to the Secretary and such lands or materials shall immediately revert to the control of the Secretary of the Department from which they had been appropriated.

(d) The provisions of this section shall apply only to projects constructed on a Federal-aid system or under the provisions of chapter 2 of this title.

Sec. 318. Highway relocation due to airport

Federal highway funds shall not be used for the reconstruction or relocation of any highway giving access to an airport constructed or extended after December 20, 1944, or for the reconstruction or relocation of any highway which has been or may be closed or the usefulness of which has been or may be impaired by the location or construction of any airport constructed or extended after December 20, 1944, unless, prior to such construction or extension, as the case may be, the State highway department and the Secretary have concurred with the officials in charge of the airport that the location of such airport or extension thereof and the consequent reconstruction or relocation of the highway are in the public interest.

Sec. 319. Landscaping and scenic enhancement

(a) The Secretary may approve as a part of the construction of Federal-aid highways the costs of landscape and roadside development, including acquisition and development of publicly owned and controlled rest and recreation areas and sanitary and other facilities reasonably necessary to accommodate the traveling public.

(b) An amount equivalent to 3 per centum of the funds apportioned to a State for Federal-aid highways for any fiscal year shall be allocated to that State out of funds appropriated under authority of this subsection, which shall be used for landscape and roadside develcpment within the highway right-of-way and for acquision of interests in and improvement of strips of land necessary for the restoration, preservation, and enhancement of scenic beauty adjacent to such highways, including acquisition and development of publicly owned and controlled rest and recreation areas and sanitary and other facilities within or adjacent to the highway right-of-way reasonably necessary to accommodate the traveling public, without being matched by the State. The Secretary may authorize exceptions from this requirement, upon application of a State and upon a showing that such amount is in excess of the needs of the State for these purposes. Any funds not used as required by this subsection shall lapse. There is authorized to be appropriated to carry out this subsection, out of any money in the Treasury not otherwise appropriated, not to exceed $120,000,000 for the fiscal year ending June 30, 1966, and not to exceed $120,000,000 for the fiscal year ending June 30, 1967. No part of the Highway Trust Fund shall be available to carry out this subsection.65a

Sec. 320. Bridges on Federal dams

(a) Each executive department, independent establishment, office, board, bureau, commission, authority, administration, corporation wholly owned or controlled by the United States, or other agency of the Government of the United States, hereinafter collectively and individually referred to as "agency", which on or after July 29, 1946,

65a Revised by sec. 301 of Public Law 89-285, Oct. 22, 1965 (79 Stat. 1032).

has jurisdiction over and custody of any dam constructed or to be constructed and owned by or for the United States, is authorized, with any funds available to it, to design and construct any such dam in such manner that it will constitute and serve as a suitable and adequate foundation to support a public highway bridge upon and across such dam, and to design and construct upon the foundation thus provided a public highway bridge upon and across such dam. The highway department of the State in which such dam shall be located, jointly with the Secretary, shall first determine and certify to such agency that such bridge is economically desirable and needed as a link in the State or Federal-aid highway systems, and shall request such agency to design and construct such dam so that it will serve as a suitable and adequate foundation for a public highway bridge and to design and construct such public highway bridge upon and across such dam, and shall agree to reimburse such agency pursuant to subsection (d) of this section for any additional costs which it may be required to incur because of the design and construction of such dam so that it will serve as a foundation for a public highway bridge and for expenditures which it may find it necessary to make in designing and constructing such public highway bridge upon and across such dam. In no case shall the design and construction of a bridge upon and across such dam be undertaken hereunder except by the agency having jurisdiction over and custody of the dam, acting directly or through contractors employed by it, and after such agency shall determine that it will be structurally feasible and will not interfere with the proper functioning and operation of the dam.

(b) Construction of any bridge upon and across any dam pursuant to this section shall not be commenced unless and until the State in which such bridge is to be located, or the appropriate subdivision of such State, shall enter into agreement with such agency and with the Secretary to construct, or cause to be constructed, with or without the aid of Federal funds, the approach roads necessary to connect such bridge with existing public highways and to maintain, or cause to be maintained, such approach roads from and after their completion. Such agreement may also provide for the design and construction of such bridge upon and across the dam by such agency of the United States and for reimbursing such agency the costs incurred by it in the design and construction of the bridge as provided in subsection (d) of this section. Any such agency is hereby authorized to convey to the State, or to the appropriate subdivision thereof, without costs, such easements and rights-of-way in its custody or over lands of the United States in its custody and control as may be necessary, convenient, or proper for the location, construction, and maintenance of the approach roads referred to in this section including such roadside parks or recreational areas of limited size as may be deemed necessary for the accommodation of the traveling public. Any bridge constructed pursuant to this section upon and across a dam in the custody and jurisdiction of any agency of the United States, including such portion thereof, if any, as may extend beyond the physical limits of the dam, shall constitute and remain a part of said dam and be maintained by the agency. Any such agency may enter into any such contracts and agreements with the State or its subdivisions respecting public use of any bridge so located and constructed as may be deemed