Ohio Rev. Code § 4511.122: Hands free law signs.

(A) The department of transportation shall include a sign, in the department's manual for a uniform system of traffic control devices adopted under section 4511.09 of the Revised Code, regarding the prohibition against using an electronic wireless communications device while driving, as established under section 4511.204 of the Revised Code.

(B) The director of transportation shall erect the signs established by this section in the following locations:

(1) Where an interstate or United States route enters Ohio;

(2) Where a road, originating from a commercial service airport, exits the airport's property.