The Monroe County, New York, Department of Transportation maintains 663 miles (1,067 km) of roads as county routes. Unlike most counties in New York, Monroe County does not post reassurance markers along its county routes. In fact, the only field reference to a route's designation are reference markers posted at bridges and culverts along the highway, which carry the county route number on the second line. Routes that do not cross either type of structure at some point are completely unsigned. As a result, county routes in Monroe County are widely known by their road name and not by their number.