Notwithstanding anything in the previous provisions of this Chapter, neither the Secretary of State nor a local planning authority shall be required to consider representations or objections with respect to a unitary development plan or any proposals for the alteration or replacement of such a plan if it appears to the Secretary of State or, as the case may be, the authority that those representations or objections are in substance representations or objections with respect to things done or proposed to be done in pursuance of—
an order or scheme under section 10, 14, 16, 18, 106(1) or (3) or 108(1) of the Highways Act 1980;
an order or scheme under any provision replaced by the provisions mentioned in paragraph (a), namely, an order or scheme under section 7, 9, 11, 13 or 20 of the Highways Act 1959, section 3 of the Highways (Miscellaneous Provisions) Act 1961 or section 1 or 10 of the Highways Act 1971; or
an order under section 1 of the New Towns Act 1981.