Topic summary
Corridor M
Extracted from the Wikipedia article Appalachian Development Highway System.
Corridor M
Corridor M is a highway in the U.S. state of Pennsylvania. It follows Pennsylvania Route 66 from Interstate 76 near New Stanton to an intersection near Delmont, where it follows U.S. Route 22 until the Interstate 81 interchange near Harrisburg. A large portion near the center of the route has not yet been upgraded to a four-lane divided highway.