The route was split on May 9, 1966 by eliminating the section between US 309 in Allentown and US 11 in West Nanticoke, removing a number of overlaps that linked the two segments. The former alignment of PA 29 became solely US 309 (now PA 309) between Allentown and Schnecksville, newly-designated PA 873 between Schnecksville and Lehigh Gap, newly-designated PA 248 between Lehigh Gap and Weissport, solely US 209 between Weissport and Nesquehoning, an extension of PA 93 between Nesquehoning and Nescopeck, an extension of PA 239 between Nescopeck and Shickshinny, and solely US 11 between Shickshinny and West Nanticoke.