The new highways which the Secretary of State proposes to construct–
(a) along the route described in Schedule 1 (the highway along this route being in this Order referred to as “the main new trunk road”); and
(b) along the route described in Schedule 2 which connects the main new trunk road with another highway (the highway along this route being in this order referred to as “the slip road”), shall become trunk roads as from the date when this Order comes into force.