sentences:  In the 1928 renumbering, the alignments of PA 171 were designated as Pennsylvania Route 70, Pennsylvania Route 602, and Pennsylvania Route 692, which stretched the highway from US 6/US 106 in Carbondale to the New York state line at Hallstead.In 1946, PA 692 and PA 602 were later removed from the state system and replaced by an extended PA 70.In 1961, PA 70 was renumbered as PA 171 to prevent duplication with I-70.