4.—(1) Subject to articles 5 to 7 below, the exempted vehicles are hereby authorised to be used for carriage even though they do not conform with those provisions of the Rail Vehicle Accessibility Regulations 1998 referred to in paragraph (2) below.
(2) The provisions with which the exempted vehicles are not required to conform are—
regulation 4(2);
regulation 5(1)(a), (b) and (c), but subject to the condition in article 5 below;
regulation 6(1)(b) and (d);
regulation 11(1)(a);
regulation 13(7), but only in so far as it relates to the height of letters and numbers on visual systems which are not on the front of an exempted vehicle; and
regulation 20(1)(d) and (e).