sentences:  The original route designation that follows current-day PA 171 was a part of Legislative Route 10, which ran from an intersection with Legislative Route 9 (currently an intersection with PA 706) in New Milford Township to the New York state line, where it follows current day PA 92's alignment.When the mass state highway numbering in Pennsylvania occurred in 1928, the alignment of PA 171 was designated as Pennsylvania Route 70 from US 6 in Carbondale to Oakland at PA 92, from there to US 11 in Great Bend, it was designated as PA 692, and from US 11 to the New York state line at Hallstead, it was designated as PA 602.The alignment of PA 70 was under construction in 1929 from the Thompson Township line to Lanesboro.