Ohio Rev. Code Ann. § 4511.21
(B) It is prima-facie lawful, in the absence of a lower limit declared or established pursuant to this section by the director of transportation or local authorities, for the operator of a motor vehicle, trackless trolley, or streetcar to operate the same at a speed not exceeding the following:
(1)
(c) As used in this section, "school zone" means that portion of a street or highway passing a school fronting upon the street or highway that is encompassed by projecting the school property lines to the fronting street or highway, and also includes that portion of a state highway. Upon request from local authorities for streets and highways under their jurisdiction and that portion of a state highway under the jurisdiction of the director of transportation or a request from a county engineer in the case of a school zone for a special elementary school, the director may extend the traditional school zone boundaries. The distances in divisions (B)(1)(c)(i), (ii), and (iii) of this section shall not exceed three hundred feet per approach per direction and are bounded by whichever of the following distances or combinations thereof the director approves as most appropriate:
(e) As used in this section, "special elementary school" means a school that meets all of the following criteria:
(D) No person shall operate a motor vehicle, trackless trolley, or streetcar upon a street or highway as follows:
(H)
(I)
(K)
(1) As used in divisions (K)(1), (2), (3), and (4) of this section, "unimproved highway" means a highway consisting of any of the following:
(3)
(4)
(5) As used in division (K)(5) of this section:
(L)
(N)
(1)
(a) If the boundary of two local authorities rests on the centerline of a highway and both authorities have jurisdiction over the highway, the speed limit for the part of the highway within their joint jurisdiction shall be either one of the following as agreed to by both authorities:
(O) As used in this section:
(P)
(1) A violation of any provision of this section is one of the following: