9.—(1) Where the undertaker carries out works under this Order in relation to a highway which consists of or includes a carriageway and the works carried out are—
(a)of a description mentioned in any of paragraphs (a), (c) to (e), (g) and (h) of section 86(3) of the 1991 Act (which defines what highway authority works are major highway works); or
(b)works which, had they been executed by the highway authority, could have been carried out in exercise of the powers conferred by section 64 of the 1980 Act (dual carriageway and roundabouts),
the works shall be treated for the purposes of Part 3 of the 1991 Act (street works) as if they were major highway works carried out by the highway authority.
(2) In the application of Part 3 of the 1991 Act to works within paragraph (1) by virtue of paragraph (1), the references in that Part to the highway authority concerned shall be construed as references to the undertaker.