It then continues towards Jefferson Hills in the northwest, where it meets the northern terminus of Pennsylvania Route 43 (Mon-Fayette Expressway) at exit 54. PA 43 is expected to extend further north of PA 51. Northwest of PA 43, PA 51 becomes Clairton Boulevard.
It continues towards Jefferson Hills in the northwest, where it intersects with Pennsylvania Route 43 (Mon-Fayette Expressway) at exit 54. PA 43 is anticipated to extend further north than PA 51. Northwest of PA 43, PA 51 becomes Clairton Boulevard.