 The state truncated PA 43 to Susquehanna Street from Allentown to Bethlehem.Signs were changed to reflect the new designations on May 31, 1932, with the new route designations officially in place on June 1, 1932.Tilghman Street was eventually connected directly from Cetronia to Allentown by a bridge over Cedar Creek; Tilghman Street (west of the Lehigh River) and Union Boulevard (east of the river) were joined in 1929 by a bridge.