Ohio Rev. Code Ann. § 5529.04

The director of transportation may enter into agreements with the secretary of commerce of the United States as provided by "Federal Highway Beautification Act of 1965," 79 Stat. 1028, 23 U.S.C. 319, relating to landscaping, scenic enhancement, or the establishment of publicly owned and controlled rest and recreation areas and sanitary and other facilities necessary to accommodate the traveling public in areas within or adjacent to federal-aid highways within this state.