# The Road Traffic (Carriage of Explosives) Regulations 1989, Paragraph 3


Each placard referred to in paragraph 1(b) shall–
(a) be in the form of a square set with its side at an angle of 45° to the vertical, and
(b) have an orange-coloured background with a black border; and any figure, letter or pictograph required by the following provisions of this Schedule shall be in black.

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Source: https://www.legislation.gov.uk/uksi/1989/615/schedule/4/paragraph/3 (the official version)
Page: https://openlegislation.uk/road-traffic-carriage-of-explosives-regulations-1989/schedule-4/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.