State Route 108 (SR 108) is a 49.30-mile (79.34 km) state route that runs between SR 15 and the Michigan state line in the US state of Ohio. Most of the route is a rural two-lane highway and passes through both farmland and residential properties.

U.S. Route 24 (US 24) is a United States Numbered Highway that runs from Minturn, Colorado, to Independence Township, Michigan. In Ohio, it is an expressway and freeway for much of its length, from the Indiana state line to Maumee. From there northeast to the Michigan state line at Toledo, it is a surface highway.