# The Road Vehicles (Authorisation of Special Types) (General) Order 2003, Paragraph 15

Extent: E+W+S

(1) Each AILV or AILV-combination must be fitted with—
(a) a sign that indicates which of Categories 1, 2 or 3 the AILV or AILV-combination falls into; or
(b) a sign that is approved in connection with vehicles carrying loads of exceptional dimensions by the appropriate authority in another EEA State or in any other country which is a member of the United Nations Economic Commission for Europe.
(2) A sign falling within sub-paragraph (1)(a) must—
(a) be mounted in a clearly visible position on the front of the vehicle (or, in the case of an AILV-combination, on the front of the foremost motor vehicle);
(b) face forwards;
(c) be as near to the vertical plane as possible;
(d) be kept clean and unobscured at all times; and
(e) except as stated in sub-paragraph (3), consist of white letters on a black background in the following format (specifying Category 1, 2 or 3, as appropriate to the vehicle in question)—
(3) The dimensions of the sign specified for the purposes of sub-paragraph (2)(e) may vary up or down by a margin of 5 per cent.

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Source: https://www.legislation.gov.uk/uksi/2003/1998/schedule/1/paragraph/15 (the official version)
Page: https://openlegislation.uk/road-vehicles-authorisation-of-special-types-general-order-2003/schedule-1/paragraph-15
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.