 Through these different communities, this road is defined as Old Route 22, Shartlesville Road, and Hex Highway.From Cetronia east, the old road is State Route 1002 in Lehigh County, comprising Tilghman Street and Union Boulevard in Allentown.In Northampton County, the 1940s highway is Union Boulevard, Linden Street, and Easton Avenue in Bethlehem; William Penn Highway between Bethlehem and Easton; and Butler Street, 13th Street, and Northampton Street in Easton.