Whenever any public road--or turnpike, which, under existing laws, becomes a public road--is between two or more townships or on any division line between the same, in any county of this commonwealth, has become useless, inconvenient, or burdensome, the court of quarter sessions of the county in which the said road is located shall have the authority, upon application to it by petition, signed by at least fifteen property owners of each of said townships, who are qualified electors therein, setting forth the facts, to inquire of and to change or vacate the whole or any part of said road, whenever the same shall have become useless, inconvenient, or burdensome; and the same court shall proceed therein, by views and viewers, in the manner provided for the laying out of roads and highways under existing laws.