Whenever the secretary shall deem it necessary or desirable that the lines, widths or grades of any such street or section thereof be revised or changed prior to, and for the purpose of facilitating the construction, reconstruction or improvement of, any such street, the secretary, may with the approval of the Governor, enter into agreements with any such city within the limits of which such streets or section thereof to be constructed, reconstructed or improved are located, for the revision and change of lines, widths and grades of such street or section thereof, and such revision and changes shall be made by such city on the city plan in accordance with the law and procedure applicable thereto.
36 P.S. § 670-544