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

Extent: E+W+S

The light reflected by the reflectors or reflecting material, or emitted by the light source, from a stud must be—
(a) red—
(i) when placed in conjunction with the marking shown at item 27 of the table in Part 4 of this Schedule, as viewed in the direction of travel;
(ii) when placed in conjunction with a road marking to indicate the nearside, as viewed in the direction of travel, edge of the carriageway of any road, except a motorway alongside which there is an actively managed hard shoulder; or
(iii) when placed in conjunction with the marking at item 11 in the table in Part 4 of this Schedule, to indicate the boundary between the carriageway of a motorway and an actively managed hard shoulder;
(b) amber, to indicate the off side edge of a carriageway which—
(i) is contiguous to a central reservation or to traffic cones or cylinders at road works or to the road marking at item 24 of the table in Part 4 of this Schedule; or
(ii) carries traffic in one direction only; and
(c) green, when placed in conjunction with a road marking at item 10 of the table in Part 4 of this Schedule, where the edge of any part of the carriageway available for through traffic at a junction, a lay-by or a parking place is so indicated to drivers of approaching vehicles.

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Source: https://www.legislation.gov.uk/uksi/2016/362/schedule/11/part/6/paragraph/11 (the official version)
Page: https://openlegislation.uk/traffic-signs-regulations-and-general-directions-2016/schedule-11/part-6/paragraph-11
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.