# The Traffic Signs Regulations and General Directions 2016, Paragraph 7

Extent: E+W+S

(1) The background of the sign must be yellow, white or blue.
(2) Letters, numerals, other characters, chevrons and borders must be—
(a) black when placed on a yellow background;
(b) black or blue when placed on a white background; or
(c) white when placed on a blue background.
(3) This paragraph is subject to paragraphs 8 to 11.

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Source: https://www.legislation.gov.uk/uksi/2016/362/schedule/13/part/9/paragraph/7 (the official version)
Page: https://openlegislation.uk/traffic-signs-regulations-and-general-directions-2016/schedule-13/part-9/paragraph-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.