Pennsylvania State Route 50 is a east-west highway in South-Central Allegheny County. It runs from the Allegheny/Washington County Line to Nobelstown Road in Pittsburgh. PA St Rt 50 passes through the following towns in Allegheny County. Bridgeville Kirwan Heights Heidelberg Carnegie Pittsburgh PA St Rt 50 is not multi-plexed in Allegheny County. PA St Rt 50 intersects the following highways in Allegheny County. Interstate 79, near Bridgeville. Interstate 376, near Carnegie. U.S. Rt. 22, near Carnegie. U.S. Rt. 30, near Carnegie. Pennsylvania State Route 121, near near Green Tree. Pennsylvania State Route 60, at Pittsburgh.