ODOT must approve speed zones for roads and streets to have speed limits set lower than the statutory prima-facie speed limits given in the Ohio Revised Code, regardless of jurisdiction. This includes rural state highways, county and township roads, and streets in both cities and villages. However, a board of trustees has the authority to lower the speed limit without ODOT approval on a road that is an "unimproved highway" or is in an area that meets the Ohio Revised Code definition of a commercial or residential subdivision.
While both cities and villages are required to have ODOT approval to have a speed limit lower than the statutory prima-facie speed limits given in the Ohio Revised Code, they can raise speed limits on their streets without ODOT approval. The Ohio Revised Code states in part, "Local authorities in their respective jurisdictions may authorize by ordinance higher prima-facie speeds than those stated in this section upon through highways, or upon highways or portions thereof where there are no intersections, or between widely spaced intersections, provided signs are erected giving notice of the authorized speed, but local authorities shall not modify or alter the basic rule set forth in division (A) of this section or in any event authorize by ordinance a speed in excess of fifty miles per hour."
Speed Limit Process for Local Roadways