# The Traffic Signs Regulations and General Directions 2016, Paragraph 5

Extent: E+W+S

(1) The sign (“an edge of carriageway sign”) must be placed so that the top of the sign is not less than 550 mm nor more than 1000 mm above the surface of the adjacent carriageway.
(2) Where an edge of carriageway sign is mounted on a post specifically provided for the purpose that part of the post which extends above ground level may be—
(a) of any single colour; or
(b) coloured black and white in alternate horizontal bands, each band being not less than 225 mm or more than 350 mm deep.
(3) An edge of carriageway sign must be erected to display—
(a) the colour red on the left hand edge of the carriageway as viewed by the drivers of approaching vehicles; and
(b) the colour white on the right hand edge of the carriageway when so viewed, unless the edge is the edge of the carriageway of a dual carriageway road or a one-way road when the colour amber must be displayed.

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Source: https://www.legislation.gov.uk/uksi/2016/362/schedule/2/part/8/paragraph/5 (the official version)
Page: https://openlegislation.uk/traffic-signs-regulations-and-general-directions-2016/schedule-2/part-8/paragraph-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.