# The Traffic Signs Regulations and General Directions 2016, Paragraph 4

Extent: E+W+S

The part of a cone, cylinder or delineator coloured white must, subject to paragraph 7, be illuminated with white retroreflecting material and the part coloured red (except, in the case of a delineator, on the reverse side when that side is coloured only red) may be illuminated with red retroreflecting material.

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Source: https://www.legislation.gov.uk/uksi/2016/362/schedule/13/part/8/paragraph/4 (the official version)
Page: https://openlegislation.uk/traffic-signs-regulations-and-general-directions-2016/schedule-13/part-8/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.