some farm fields. The road turns to the southeast and enters Union Township. The route continues through wooded areas with some farmland and homes, passing to the south of New Castle Municipal Airport and heading through the community of Parkstown. US 224 heads into commercial areas, gaining a second lane westbound before widening into a six-lane divided highway as it comes to an interchange with I-376/US 422. Past this interchange, the road becomes a three-lane road with a center left-turn lane and passes through a mix of residences and businesses, running through the community of Oakwood. The route heads into the city of New Castle and passes through wooded areas of development, gaining a second westbound lane and coming to an intersection with US 422 Business. At this point, US 422 Business turns east to join US 224 on four-lane divided West Falls Street, passing more development and crossing over a New Castle Industrial Railroad line and the Shenango River. The road heads to the east and continues through commercial areas. US 224 ends at an intersection with PA 18, at which point US 422 Business turns south to join that route. History US 224 was assigned to a portion of the Benjamin Franklin Highway, an auto trail running from Omaha, Nebraska to Philadelphia, Pennsylvania; its number assignment was an alternative to a westward rerouting of US 422 which runs along the Benjamin Franklin Highway farther east. When US 224 was commissioned in Indiana in 1934, it replaced State Road 16 (SR 16), from Huntington to the Ohio state line. Although US 224 is only in Pennsylvania for 10 miles, the eastern terminus has changed several times since 1933, ending at various points in New Castle, Pennsylvania or in adjacent Union Township west of the city. The eastern terminus has been moved five times (1936, 1947, 1974, 1977, 2008), the most notable of which was in the 1970s when the New Castle Bypass opened in 1974 and the state extended US 224 through the city and into Shenango Township at the eastern terminus of the bypass, taking over US 422's old alignment after that highway was moved to the bypass. The route was truncated back at the current interchange with US 422 and I-376 in 1977 while the old alignment through New Castle was replaced by Business US 422. This would be the case until March 20, 2008, when US