Between Fredericksburg and just west of Allentown, US 22 runs concurrently with Interstate 78 (I-78). The portion from the Pennsylvania Route 66 (PA 66) interchange near Delmont east to the Interstate 81 (I-81) interchange near Harrisburg is the main part of Corridor M of the Appalachian Development Highway System, although a large portion near the center of the route has not yet been upgraded to a four-lane divided highway. Much of US 22 in Pennsylvania follows the route of the historic William Penn Highway. In Pennsylvania, the route runs for 338.20 miles (544.28 km) between the West Virginia state line in Washington County, where it is a freeway through the western suburbs of Pittsburgh, east to the Pennsylvania- New Jersey state line in the Lehigh Valley at Easton in the east. ![]() highway that stretches from Cincinnati, Ohio, in the west, to Newark, New Jersey, in the east. Washington, Allegheny, Westmoreland, Indiana, Cambria, Blair, Huntingdon, Mifflin, Juniata, Perry, Dauphin, Lebanon, Berks, Lehigh, Northampton I-476 Toll / Penna Turnpike NE Extension in South Whitehall Township ![]() I-78 concurrency from Fredericksburg to Kuhnsville I-76 Toll / Penna Turnpike in Monroeville I-376 concurrency from Robinson Township to Monroeville US 22 at West Virginia border in Hanover Township ![]() US 22 highlighted in red and business routes in blue
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