A special road to be provided by the Secretary of State in accordance with a scheme under section 7 of this Act shall, except in so far as it is provided by means of the appropriation or transfer of any existing road, become a trunk road on such date as may be specified in the scheme.

A road (not being a trunk road) which, by means of an order under section 9 of this Act, is appropriated as a special road to be provided by the Secretary of State, and a road which, by means of such an order, is transferred to the Secretary of State, shall become a trunk road on the date on which it is so appropriated or is so transferred, as the case may be.

Subsections (1) and (2) above shall have effect subject to any provision of the scheme under section 7 of this Act directing that the special road in question or any part of it shall not be a trunk road; but any such provision shall not affect the power of the Secretary of State to make an order under section 5(2)(a) of this Act with respect to the special road or part.