Ohio Revised Code Title LV. Roads Highways Bridges § 5516.06

(A) Directional and other official signs and notices that conform to rules adopted by the director of transportation;

(B) Signs advertising the sale or lease of the property upon which they are located;

(C) Advertising devices indicating the name of the business, activities, or profession conducted on such property or that identify the goods produced, sold, or services rendered on such property and that conform to rules adopted by the director;

(D) Precautionary signs relating to the premises;

(E) Signs, displays, or devices which locate, identify, mark, or warn of the presence of pipe lines, utility lines, or rail lines, and appurtenances thereof, including, but not limited to, markers used in the maintenance, operation, observation, and safety of said lines;

(F) Advertising devices located in zoned or unzoned industrial or commercial areas adjacent to highways on the primary system that conform to rules adopted by the director;

(G) Signs lawfully in existence on October 22, 1965, that the director, subject to the approval of the secretary of the United States department of transportation, has determined to be landmark signs, including signs on farm structures or natural surfaces, which are of historic or artistic significance;

(H) Advertising devices that are located on the premises of a professional sports facility and that conform to rules adopted by the director.