Instead, it winds through hilly terrain that parallels the Turnpike. As PA 31 nears Manns Choice, it intersects Pennsylvania Route 96 and is concurrent for . After separating, PA 31 continues for before terminating at U.S. Route 30. As early as 1772, a road called Glades Road had originally led from Somerset to Bedford, which were the places of two underground railroad stations. The road would become PA 31 and would go through the towns of West Newton, Mount Pleasant, Monongahela, and Washington that had also organized underground railroad stations. In 1911, the Sproul Road Bill defined Legislative Route 181 for the segment between Washington and West Newton, LR 186 between West Newton and Somerset, LR 364 between Somerset and Dividing Ridge, and LR 49 between Dividing Ridge and Bedford. The PA 31 designation began appearing on road maps and signage in 1927. At that time, the western terminus was at the West Virginia line at West Virginia Route 27. The east end back then was still at US 30, unchanged from today. On its way eastward, PA 31 met the southern terminus of PA 28 near Avella, was concurrent with PA 18 and US 19, and traded paths with US 40 in Washington. In September 1964, the western terminus of PA 31 was truncated to its current location at the intersection of Mount Pleasant Road and Greensburg Pike in West Newton. Two segments of the decommissioned route were renumbered. PA 136 was designated from the western terminus of PA 31 to US 40/PA 18 in Washington. PA 844 (Jefferson Avenue) was designated from PA 18 (Henderson Avenue) to the PA/WV state line. This left a gap of 1.4 miles of the former PA 31 which ran concurrently with PA 18 (and very briefly with US 40) between the termini of the newly designated routes (PA 844 east, PA 136 west). As a result, this gap did not need renumbered or any additional designations. The Glades Pike Inn is a notable inn situated on the Glades Pike section of PA 31 in Somerset. Since 1842, the inn was a place for weary travelers to unhitch their horses for a good place to eat and sleep. The modern day visitors of the inn use it for different reasons of traveling. The inn is located in the Laurel Mountains recreational area. The Glades Pike Winery is situated on the section of PA 31 known as Glades Pike, between Somerset and Donegal.