36 Pa. Stat. § 1761
In all cases wherein any proceedings are about to be had before any county commissioners or courts of this commonwealth, by petition to the said courts or commissioners, looking to the laying out, opening and construction of new roads for public use, it shall be the duty of the parties making application to the commissioners or to the courts for the appointment of viewers, reviewers or re-reviewers to lay out, open or construct such public road, to give written notice of such application to the supervisors or commissioners of roads and highways of the territory through which the proposed public road is designed to be laid out and constructed, of the time and place of such application, and of the time and place of the meeting of viewers, reviewers or re-reviewers, and a copy of said written notice, properly attested, shall be filed among the records of the court having cognizance of the matter, and a failure to comply with the provisions of this act, as to such notice, shall be sufficient grounds for an application to set aside whatever proceedings may have been taken, of which said supervisors or commissioners of roads and highways had no written notice.
36 P.S. § 1761