14.—(1) Where the Department considers it expedient for the purpose of extending, improving or reorganising the trunk system that any road should be designated as a trunk road, the Department may by order direct that—
(a)any existing road;
(b)any road in the course of construction; or
(c)any road proposed to be constructed,
shall become a trunk road; and the trunk system shall be modified accordingly.
(2) In this Article “the trunk system” means the main system of routes for through traffic in Northern Ireland.