Ohio Rev. Code § 5543.21: Public trail intersection markers.

The county engineer shall install and maintain suitable, uniform markers designating intersections with and accesses to state recreational trails, wherever any trail established pursuant to Chapter 1519. of the Revised Code intersects with a county or township road, or along any county or township road that such a trail follows. The county engineer shall similarly install and maintain suitable, uniform markers designating each public recreational trail preserved by the board of county commissioners under section 5553.044 of the Revised Code, wherever such a trial intersects with a county or township road. The markers shall include the words "public trail" and "motorized vehicles prohibited." The costs of such installation and maintenance may be paid from any county road improvement or maintenance and repair funds.