Notwithstanding anything in the preceding provisions of this Act, neither the Secretary of State nor a local planning authority shall be required to consider representations or objections with respect to a structure plan, a local plan or any proposal to alter, repeal or replace any such plan if it appears to the Secretary of State or the authority, as the case may be, that those representations or objections are in substance representations or objections with respect to things done or proposed to be done in pursuance of—
(a) an order or scheme under section 7, 9, 11, 13 or 20 of the Highways Act 1959 (trunk road orders, special road schemes and ancillary orders);
(b) a scheme under section 3 of the Highways (Miscellaneous Provisions) Act 1961 (scheme for construction of bridge or tunnel as part of maintainable highway);
(c) an order under section 1 of the Highways Act 1971 (classified road order) or section 10 thereof (order authorising diversion of navigable watercourse);
(d) an order under section 1 of the New Towns Act 1965 (designation of sites of new towns).