# The Traffic Signs Regulations and General Directions 2016, Paragraph 11

Extent: E+W+S

(1) Subject to sub-paragraphs (2) and (3), the parts of the sign not coloured black must be reflectorised.
(2) The part of the sign coloured yellow must be fluorescent, unless the retroreflecting material is applied to that part in horizontal strips with a gap between each strip or the retroreflecting material is itself also fluorescent.
(3) The part of the sign coloured red may be fluorescent.

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Source: https://www.legislation.gov.uk/uksi/2016/362/schedule/14/part/4/paragraph/11 (the official version)
Page: https://openlegislation.uk/traffic-signs-regulations-and-general-directions-2016/schedule-14/part-4/paragraph-11
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.