# The Traffic Signs Regulations and General Directions 2016, Paragraph 19

Extent: E+W+S

Where an amber or blue light beacon or a warning light is mounted on a structure specially provided for the purpose, the structure must be coloured—
(a) grey, red, white, or yellow; or
(b) have alternate bands of—
(i) red and white; or
(ii) black and white.

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Source: https://www.legislation.gov.uk/uksi/2016/362/schedule/13/paragraph/19 (the official version)
Page: https://openlegislation.uk/traffic-signs-regulations-and-general-directions-2016/schedule-13/paragraph-19
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.