9(1)The Secretary of State may by order made by statutory instrument vary or revoke a traffic regulation order (whenever made) if the Secretary of State considers the variation or revocation—U.K.
(a)necessary for the purposes of the timely, efficient and cost-effective construction of the works authorised by this Act, and
(b)reasonable in the circumstances.
(2)This paragraph has effect without prejudice to the powers conferred on the Secretary of State by paragraphs 7 and 8.