Pennsylvania Route 171 (PA 171, also designated by the Pennsylvania Department of Transportation as SR 0171) is a 40.17-mile-long (64.65 km) north–south state highway located in northeast Pennsylvania. The southern terminus of the route is at U.S. Route 6 Business (US 6 Bus.) in Carbondale. The northern terminus is officially at an intersection with US 11, 250 feet (76 m) to the west of Interstate 81 (I-81). PA 171, at its southern end, was once part of the Providence and Carbondale Turnpike, a turnpike which ran along US 6 Bus. from Dickson City to Carbondale and PA 171 from Carbondale to Forest City. The turnpike, chartered in 1851, ran from Scranton until being abandoned in 1889. In 1911, after the Sproul Road Bill was signed, a large segment of PA 171 was designated as Legislative Route 10. This was its designation for several years, and in 1928, the mass amount of state highways in Pennsylvania were designated. 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. From Wikipedia
