12(1)Where under this Act the nominated undertaker—U.K.
(a)constructs a new highway, or
(b)alters a highway, otherwise than by carrying out street works within the meaning of Part 3 of the New Roads and Street Works Act 1991,
the construction or alteration must be completed to the reasonable satisfaction of the highway authority.
(2)Where work mentioned in sub-paragraph (1) has been completed to the reasonable satisfaction of a highway authority, it must certify that fact in writing to the nominated undertaker.
(3)If the nominated undertaker requests a highway authority to issue a certificate under sub-paragraph (2) and the highway authority does not before the end of the period of 28 days beginning with the date on which the request was made—
(a)issue a certificate under that sub-paragraph, or
(b)notify the nominated undertaker of its decision to refuse to issue such a certificate,
it is to be treated as having issued such a certificate at the end of that period.
(4)Any dispute with a highway authority under this paragraph must be referred to arbitration if the parties so agree, but must otherwise be determined by the Secretary of State.