It shall be the duty of all persons appointed in the several counties of this commonwealth to view and review any public or private road or bridge, if they shall decide in favor of locating said road or bridge, to endeavor to procure from the persons over whose land such location may be made releases from all claims for damages that might arise from the opening of such road or the building of such bridge; and in every case where said viewers shall fail to procure such releases, and it shall appear to them that any damages will be sustained, it shall be their duty to assess the damages and make report thereof, signed by a majority of their number, and return the same, together with all releases obtained, to the court of quarter sessions, and the damages so assessed shall be conclusive, or may be subject to appeal, review or modification, as may be provided by existing laws in the the different counties of this commonwealth.