Pennsylvania State Route 51 north-south highway. It runs through Central Allegheny County. For the most part it runs along the Ohio and Monongahela Rivers. PA St Rt 51 passes through the following towns in Allegheny County. Jefferson Hills Lebanon Pittsburgh McKees Rocks Coraopolis PA St Rt 51 is multi-plexed in Allegheny County. TRUCK U.S. Rt. 19, at Pittsburg.
A BGS on SB I-579. A guide sign near the Liberty Tunnel. A set of BGS's at the Liberty Tunnel. A set of guide signs near the Liberty Tunnel. NB TRUCK U.S. Rt. 19/PA St Rt 51 west of the Liberty Tunnel. NB TRUCK U.S. Rt. 19/PA St Rt 51 near Woodruff. A guide marker on NB PA St Rt 51. NB TRUCK U.S. Rt. 19/PA St Rt 51 east of I-376/U.S. Rt. 19-22-30. A BGS on EB I-376; NB U.S. Rt. 19; EB U.S. Rt. 22/30. A BGS on EB I-376; EB U.S. Rt. 22/30. A BGS on NB I-279; EB U.S. Rt. 22/30. A BGS on EB I-376; U.S. Rt. 22/30. A BGS on WB I-376/TK U.S. Rt. 19; U.S. Rt. 22/30. A guide marker on WB BUSN Loop I-376.
