36 Pa. Stat. § 670-524
Before the department shall enter into an agreement with any city for the construction, reconstruction or resurfacing of any of the streets, or sections thereof, designated as State highways by any act of Assembly, the city shall take the necessary steps to compel all public utility companies to make any necessary replacements or renewals of any of their structures located within the lines of the improvement prior to the commencement of work, and shall further agree that the street, or sections thereof, when completed, shall not be torn up or opened for a period of five (5) years, except in emergency cases, and subject to the same conditions and restrictions as prescribed by section five hundred fifteen of this act with reference to the opening of State highways in boroughs.
36 P.S. § 670-524