Mapcat has argued with me, RickMast, & Markkos over this route and objecting to it. The only signs for it are along US 23, and there are none along Marion-Williamport Rd. The only other sign for this 'Truck Route' is the 'To US 23' Shield along Oh 95, west of Marion (near a Whirlpool manufacturing plant).
To IMGoph, those missing "add-on" shields, for 95 & 309, along US 23, have been missing for years now. Going on 5-10 years.