Pennsylvania Route 252 is a north–south state highway in the U.S. state of Pennsylvania that connects PA 320 in Nether Providence Township at its southern terminus to PA 23 in Valley Forge at its northern terminus. The route runs through the western suburbs of Philadelphia in Delaware, Chester, and Montgomery counties, including Nether Providence Township, the borough of Media, Upper Providence Township, Marple Township, Newtown Township, Easttown Township, Tredyffrin Township, and Upper Merion Township. The route intersects many roads including U.S. Route 1 north of Media, PA 3 in Newtown Square, US 30 in Paoli, and US 202 near Berwyn.

Pennsylvania Route 320 is a north–south state highway in southeastern Pennsylvania. The southern terminus of the 18.8-mile (30.3 km) long route is at U.S. Route 13 /PA 291 in Chester. The northern terminus is at PA 23 in Swedeland. The route passes through suburban areas in Delaware and Montgomery counties to the west of Philadelphia, serving Swarthmore, Springfield, Broomall, Villanova, and Gulph Mills. PA 320 intersects many important highways including US 13 Business and Interstate 95 (I-95) in Chester, US 1 in Springfield, US 30 in Villanova, and I-76 in Gulph Mills. PA 320 runs parallel to I-476 for much of its length and crosses it four times. Even though there are no direct interchanges between I-476 and PA 320, several roads that intersect PA 320 provide access to I-476.