Ohio Rev. Code Ann. § 4907.471
(A) The public utilities commission shall survey all public crossings of railroads at grade, whether on state, county, or township highways or on streets or ways within municipal corporations. The commission shall devise a formula according to sound highway engineering practice for determining the probability of accident at each such crossing and may include in the formula factors representing volume of vehicular traffic, volume of train traffic, history of previous accidents, train type and speed, limitations of view, intersection angle, number of tracks, highway alignment, and such other special factors and conditions as are in its opinion relevant. The commission shall submit the formula to the director of transportation, who shall review it to ensure that it is consistent with applicable federal requirements. The commission shall classify all such public crossings according to that formula and shall prepare a priority list for the protection of such crossings, giving highest priority to the crossings at which the commission finds the highest probability of accident, and lowest priority to the ones at which it finds the least probability of accident, provided that for the purposes of this section the commission shall place first on the list any crossing that meets all of the following criteria: