17.—(1) Where any part of any highway has been broken up or disturbed by the undertaker and not permanently stopped up or diverted, the undertaker shall make good the subsoil, foundations and surface of that part of the highway to the reasonable satisfaction of TfL, and shall maintain the same to the reasonable satisfaction of TfL for such time as may reasonably be required for the permanent reinstatement of the highway.
(2) The reinstatement of that part of the highway shall be carried out by the undertaker to the reasonable satisfaction of TfL in accordance with such requirements as to specification of material and standards of workmanship as may be prescribed for equivalent reinstatement work by regulations made under section 71 of the 1991 Act.