With regard to a street or portion of a street within township limits, a township may, with or without petition of abutting property owners, do any of the following:
(1) Lay out, open, widen, straighten, alter, extend, relocate and improve.
(2) Establish or reestablish the grades.
(3) Keep in order and repair and in safe passable condition.
(4) Vacate and discontinue when deemed expedient for the public good.
(5) With the approval of the Department of Transportation, vacate highways laid out by the Commonwealth within the township limits which have remained unopened for 30 years.