For the Soviet rocket engine, see
РД-170.
State highway in Wayne County, Pennsylvania, US
Pennsylvania Route 170 (PA 170, designated by the Pennsylvania Department of Transportation as SR 170) is an 11.65-mile-long (18.75 km) state highway located in Wayne County in Pennsylvania. The southern terminus is at U.S. Route 6 (US 6) in Prompton. The northern terminus is at PA 670 near Mount Pleasant Township. The route was designated in 1928 by the Pennsylvania Department of Highways as a spur of PA 70, although did not intersect with PA 70. Route 70 was renumbered in 1961 to PA 171. It is currently one of three remaining spurs of PA 70, including PA 370 and PA 670.