36 Pa. Stat. § 670-511
The secretary, with the approval of the Governor, may, in accordance with the provisions of section two hundred ten of this act, change, alter or establish the width, grades or lines of any State highway or intersecting road or street in a borough or incorporated town, before or after construction, reconstruction or improvement of the same, not, however, exceeding the maximum width fixed by law for public roads.
All damages resulting from a change of width or of existing lines and locations under the provisions of this section shall be ascertained and paid as provided in Article III of this act.
Whenever the secretary shall change, alter or establish the widths, grades or lines of any State highway within a borough or incorporated town, it shall not be necessary to submit the plans therefor to the county commissioners for approval unless responsibility for the property damages is to be assumed by passage of a proper resolution of the county commissioners. Borough councils by passage of a proper ordinance, may adopt the plan of the department as and for the action of the borough in establishing the widths, lines, grades and drainage structures as shown thereon and in such event, the borough shall be responsible for settlement and payment of the resultant property damages; or the borough may enter into an agreement with the secretary, subject to the terms of a resolution of the borough council authorizing the same, whereby the borough will pay the resultant property damages, in whole or in part, upon such terms as may be agreed upon with the secretary.
36 P.S. § 670-511