Ohio State Route 300 is a six-mile north-south highway in western Sandusky County. Its entire purpose seems to be to serve the town of Gibsonburg, which is about 20 miles southeast of Toledo. The northern end is at US Route 20. Ohio Route 300 then crosses Ohio Route 600 in Gibsonburg, before reaching its southern extent at US Route 6 near Helena. Ohio Route 300 is arrow-straight, running due north-south without any appreciable curves.
My photo of Ohio Route 300 signage shows the westbound junction marker along US Route 20, signifying the state route's northern end. This is a couple miles southeast of Woodville, Ohio. This sign assembly helps westbound travelers on US Route 20 anticipate the left turn required to reach Ohio Route 300. I captured this photo in October 2016, as I was making a wild detour north to Toledo on the way home from West Virginia.