The lengths of the trunk road described in column 1 of the Schedule to this Order and shown by broad striped hatching on the deposited plan shall cease to be trunk road and shall be classified as principal road as from the date on which the Secretary of State for Transport gives notification that the new motorway between Umberslade and Warwick in the case of the lengths of the trunk road given the reference letters A and B in column 2 of that schedule, and between Warwick and Wendlebury in the case of the lengths of the trunk road given the reference letters C, D and E, is open for through traffic—
(a) in the case of the length given the reference letter A, to the Council of the Metropolitan Borough of Solihull;
(b) in the case of the lengths given the reference letters B and C, to the Warwickshire County Council;
(c) in the case of the length given the reference letter E, to the Oxfordshire County Council.