16 Pa. Stat. § 8705
Whenever the proper authorities of any county or borough, or the supervisors or commissioners or other legally constituted road authorities of any township or townships, deem it advisable to construct, change or alter any part of any public road under their supervision, within this Commonwealth, and can agree with the property owners affected by such change as to damages, they--the said county or borough authorities, or township supervisors or commissioners, or other legally constituted road authorities--are hereby authorized, upon payment of damages agreed upon, to change or alter such part of such public road as contemplated in such agreement, without the formality of a view as heretofore provided by law: Provided, That this authority shall not extend to any change or alteration of any part of any public road, in this Commonwealth, the costs and expenses of which, to such county, borough, or township, including damages, shall exceed three hundred dollars: And provided further, That a petition setting forth the facts, accompanied by a map or draft of such proposed change, shall be presented to the court of quarter sessions for approval before such actual change is made; whereupon the new location, thus approved by the court, shall be taken and deemed to be the public road to all intents and purposes, and the old location shall be taken and deemed to be vacated.
16 P.S. § 8705