 Wisconsin uses letters as route designations for its county roads.Routes may be labeled with a single letter (CTH-H), double letter (CTH-LL or CTH-AB) or triple letter (CTH-BBB).Roads are usually named sequentially, although the letter designation may stand for the initials of a road, a geographical feature, a political division (such as CTH KR along the Kenosha/Racine county line), or in honor of a person.