 At this point, the road passes under the eastbound lanes of I-80, running within the wide median of the interstate for a distance before passing under the westbound lanes.After this, PA 880 passes a few fields as it turns northwest, crossing into the Tiadaghton State Forest and heading into Crawford Township.The route turns to the north and runs through more of the state forest before passing through Big Rock and running near Ravensburg State Park.