US 309 entered Allentown from the south on Jordan Street ( now South 4th Street ) .
US 309 intersected PA 43 at Susquehanna Street , at which point it turned west to join PA 43 .
US 309 entered Allentown from the south on Jordan Street ( now South 4th Street ) and intersected PA 43 at Susquehanna Street , at which point it turned west to join PA 43 .