The main east-west road to West Chester is West Chester Pike, which begins in Upper Darby, Delaware County, just outside Philadelphia, and is part of Pennsylvania Route 3 (PA 3). The West Chester Pike originally existed as a private turnpike connecting Philadelphia and West Chester between 1850 and 1918, when it became a public road. In West Chester, PA 3 follows Market Street eastbound and Gay Street westbound. The main north-south road in West Chester is High Street. To the north of town, the road is known as Pottstown Pike, which connects to PA 100 near Exton (Route 100 formerly ran through town). To the south of town, the road is known as Wilmington-West Chester Pike (US 202 and US 322). US 202 and US 322 both bypass the center of West Chester on the limited-access West Chester Bypass, with US 202 heading northeast to King of Prussia and south to Wilmington, Delaware and US 322 heading northwest to Downingtown and southeast to Chester. US 322 Business passes through West Chester along Hannum Avenue, Chestnut and Market streets, and South High Street. Other state routes serving West Chester include PA 162 and PA 842, which head west towards Unionville, and PA 52, which heads southwest towards Kennett Square.