AGREEMENTS RELATING TO USE OF AIRSPACE ON INTERSTATE SYSTEM.

Sec. 104. AGREEMENTS RELATING TO USE OF AIRSPACE ON INTERSTATE SYSTEM. (a) The last sentence of section 111 of title 23 of the United States Code is amended to read as follows: “Such agreements may, however, authorize a State or political subdivision thereof to use or permit the use of the airspace above and below the established grade line of the 75 Stat. 123 highway pavement for such purposes as will not impair the full use and safety of the highway, as will not require or permit vehicular access to such space directly from such established grade line of the highway, or otherwise interfere in any way with the free flow of traffic on the Interstate System.” (b) Upon application, the Secretary of Commerce is authorized to revise any agreement made prior to the date of enactment of this Act to the extent that such agreement relates to the utilization of space on rights-of-way on the National System of Interstate and Defense Highways to conform to section 111 of title 23 of the United States Code as amended by subsection (a).