36 Pa. Stat. § 670-217
The secretary is hereby authorized to join two or more State highway routes in cities of the second class, second class A and third class, boroughs, incorporated towns, or townships, or in any two or more of such political subdivisions, by taking over or building a connecting road, not more than one mile in length, whenever such connecting road would lessen the distance between two points on separate routes, or provide a better alignment or grade. Such road, when constructed or taken over, shall become a State highway and subject to the laws relating to such highways.
Any damage occasioned by the taking of land for the construction of any such connecting road shall be determined and paid as provided by Article III of this act.
36 P.S. § 670-217