A special road to be provided by the Ministeror a strategic highways company in pursuance of a scheme under section 16 above shall, except so far as it is provided by means of the appropriation or transfer of a highway, become a trunk road on such date as may be specified in the scheme.
A highway (not being a trunk road) which, by means of an order under section 18 above, is appropriated as, or as part of, a special road to be provided by the Ministeror a strategic highways company, and a highway which, by means of such an order, is transferred to the Ministeror a strategic highways company, shall become a trunk road on the date on which it is so appropriated or is so transferred, as the case may be.