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is to carry System unit travel and that lead across land at least 90 percent owned by the Federal Government and that will connect the highways within a System unit with a convenient point on or leading to the National Highway System.

(B) Limit on length of approach roads.—

(i) In general.—A designated approach road shall not exceed—

(I) 60 miles in length between a System unit gateway and a point on or leading to the nearest convenient National Highway System road; or

(II) 30 miles in length if the approach road is on the National Highway System.

(ii) County limit.—Not to exceed 40 miles of any one approach road shall be designated in any one county.

(C) Supplementary part of system unit highway system.—An approach road designated for a System unit shall be treated as a supplementary part of the highway system of the System unit.

(2) Construction, reconstruction, and improvement.—

(A) In general.—The Secretary may construct, reconstruct, and improve approach roads designated under paragraph (1) (including bridges) and enter into agreements for the maintenance of the approach roads by State or county authorities or to maintain the approach roads when otherwise necessary.

(B) Annual allocation.—Not more than $1,500,000 shall be allocated annually for the construction, reconstruction, and improvement of System unit approach roads.

(3) Approval of secretary of agriculture required.—When an approach road is proposed under this section across or within any national forest, the Secretary shall secure the approval of the Secretary of Agriculture before construction begins.

(c) Agreement With Secretary of Transportation.—Under agreement with the Secretary, the Secretary of Transportation may carry out any provision of this section.

§ 101512. Conveyance to States of roads leading to certain historical areas

(a) Definition.—In this section, the term “State” means a State, Puerto Rico, Guam, and the Virgin Islands.

(b) Authority of Secretary.—The Secretary may, subject to conditions as seem proper to the Secretary, convey by proper quitclaim deed to any State, county, municipality, or agency of a State, county, or municipality in which the road is located, all right, title, and interest of the United States in and to any Federal Government owned or controlled road leading to any national cemetery, national military park, national historical park, national battlefield park, or national historic site administered by the Service.

(c) Notification by State, Agency, or Municipality.—Prior to the delivery of any conveyance of a road under this section, the State, county, or municipality to which the conveyance is to be made shall notify the Secretary in writing of its willingness to accept and maintain the road.