Roads upon and along a line which divides two adjoining counties, and roads forming or intended to form a continuous highway from one county to another, may be laid out, or altered, or vacated in the manner provided in the case of other roads, except that the court of quarter sessions of each county shall appoint three viewers, and that a report, as aforesaid, shall be made to each court, respectively, and that each court shall otherwise have and exercise concurrent jurisdiction therein.