36 Pa. Stat. § 670-221
The secretary, with the approval of the Governor, is authorized to take over existing public roads and streets in cities, boroughs and townships, approximately parallel to State highways, between any or all of the points named in the line or route of such State highway. Any such road may intersect with or cross over the highway to which it is approximately parallel. Any such road, when taken over, shall become a State highway and be subject to the laws relating to State highways, except that, in the case of parallel highways in cities and boroughs, approval of the councils thereof shall be required for the relocation or change of the lines or widths thereof, or for constructing and improving such parallel route wholly or in part on a new alignment.
Whenever the secretary shall adopt any existing street parallel to any State highway in any borough as a State highway, and such parallel street has been improved and constructed by the borough according to the standards of the department for the construction of streets forming parts of State highways and under plans prepared by the department, the department shall reimburse the borough for the amount expended by such borough for the improvement and construction of such street, to be determined by the councils of such borough and the department.
Any damages sustained by any property owner in connection with the construction, change of width, or relocation of such road shall be ascertained and paid as provided by Article III of this act.
36 P.S. § 670-221