Pennsylvania State Route 48 is a north-south highway in Allegheny County. It runs from Pennsylvania State Route 51, at Elizabeth, to Interstate 376/U.S. Rt. 22/BUSN U.S. Rt. 22 at Monroeville. PA St Rt 48 passes through the following towns in Allegheny County. Elizabeth McKeesport North Versailles Monroeville PA St Rt 48 is not multi-plexed in Allegheny County. PA St Rt 48 intersects the following highways in Allegheny County. Pennsylvania State Route 51, at Elizabeth. Pennsylvania State Route 148, at McKeesport. Oennsylvania State Route 48, at North Versailles. Pennsylvania State Route 130, at Monroeville. BUSN U.S. Rt. 22, at Monroeville. Interstate 376, at Monroeville. U.S. Rt. 22, at Monroeville.