Ohio Rev. Code Ann. § 5552.06
(B) In addition to the notice required by division (A) of this section, not less than thirty days before holding a public hearing, a board of county commissioners shall send a copy of the county engineer's proposed regulations, a copy of the advisory committee's recommendations, and a request for written comments to the board of township trustees of each township in the county, the department of transportation district deputy director for the district in which the county is located, a representative of the metropolitan planning organization, where applicable, and at least the local professional associations representing the following professions: