sentences:  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.It was completed the next year, when the Pennsylvania Department of Highways paved the highway from Herrick Center to Thompson and Stack Road to the Harmony Township line.