Notwithstanding anything in the foregoing provisions of this Act, neither the Minister 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 Minister 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 or 13 of the Highways Act 1959 (trunk road orders, special road schemes and ancillary orders), or under any enactment repealed by that Act making provision corresponding to any of those sections ;
(b) an order under section 1 of the New Towns Act 1946 or 1965 (designation of sites of new towns).