4.—(1) Subject to paragraph (2), the following roads shall be stopped-up—
(a)the roads at the junctions described in Part IV of the Schedule;
(b)the roads described in Part V of the Schedule at the points and at the lines specified in that Part; and
(c)the roads described in Part VI of the Schedule at the lines specified in that Part.
(2) The roads referred to in paragraph (1) shall not be stopped-up until the Department has carried out such works as it considers necessary for the provision of alternative facilities for road traffic.
(3) The Department shall carry out such works as it considers necessary to prevent or restrict to such extent as the Department thinks fit, access to the roads described in Parts IV and V of the Schedule by road traffic and to the roads described in Part VI of the Schedule to motor vehicles.