36 Pa. Stat. § 2662
Whenever any public highway running through improved or cultivated lands, in this Commonwealth, has been opened, and there shall be growing along the roadsides, and within the road limits shrubs or trees not interfering with public travel, no board of supervisors or roadmasters, or other persons in their employ, shall remove, cut, injure, or destroy or in any other manner interfere with, such shrubs or trees, unless said removal or cutting shall be absolutely necessary for the purpose of maintaining the highway at its best and highest efficiency; and, then, not until the abutting property owners shall have received notice thereof, and an agreement shall have been entered into between the local highway authorities and the abutting property owners relating to the removal, cutting or interference with said trees. If the said parties shall be unable to arrive at an agreement in respect thereto, the same shall be referred to a judge of the proper court, as aforesaid. Said judge shall examine and inquire into the subject of controversy, and, in like manner, render his decision, as provided for in section one of this act; and from which decision there shall be no appeal.
36 P.S. § 2662