(a) Authority of borough.--In accordance with the provisions of this chapter, boroughs may, with or without petition of abutting property owners, lay out, open, widen, straighten, alter, extend and improve, and may establish or reestablish the grades of, and keep in order and repair and in safe passable condition, a street or portion of a street within the borough limits or may vacate the street or portion of a street if deemed expedient for the public good and provide for the costs of alteration.
(b) Laying out or opening streets.--Boroughs may lay out or open:
(1) a street or portion of a street as it appears upon a borough plan or an official map adopted in accordance with the Pennsylvania Municipalities Planning Code or is described in an ordinance adopted in accordance with this chapter;
(2) a street or portion of a street that the borough determines to acquire by eminent domain;
(3) a street to which the public has acquired rights by constant use over a period exceeding 21 years; or
(4) a street or portion of a street, laid out or constructed by a person that the borough sees fit to open or accept as provided in this chapter.