225 ILCS 440/11

The Department, on behalf of the State of Illinois, may seek agreement with the Secretary of Transportation of the United States under Section 131 of Title 23, United States Code, as amended, that this Act is in conformance with that Section 131 and provides effective control of outdoor advertising signs as set forth therein. If such agreement cannot be reached and the penalties under subsection (b) of Section 131 are invoked, the Attorney General of this State shall institute proceedings described in subsection (1) of that Section 131.