(a) Any agreement entered into by a State pursuant to the provisions of section 12 of the Federal-Aid Highway Act of 1958, Pub. L. 85-381, 72 Stat. 95, as amended, shall provide for the control or regulation of outdoor advertising, consistent with the advertising policy and standards promulgated by the Administrator, in areas adjacent to the entire mileage of the Interstate System within that State, except such segments as may be excluded from the application of such policy and standards by section 12.

(b) Any such agreement for the control of advertising may provide for establishing publicly owned informational sites, whether publicly or privately operated, within the limits of or adjacent to the right-of-way of the Interstate System on condition that no such site shall be established or maintained except at locations and in accordance with plans, in furtherance of the advertising policy and standards, submitted to and approved by the Administrator.

(c) No advertising right in the acquisition of which Federal funds participated shall be disposed of without the prior approval of the Administrator.