# The Traffic Signs Regulations and General Directions 2016, Paragraph 9

Extent: E+W+S

Studs incorporating—
(a) reflectors;
(b) retroreflecting material;
(c) a light source which emits a steady light during the hours of darkness; or
(d) any combination,
may be used with the road marking provided they are placed at the side of, and adjacent to, the line shown in the diagram.

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Source: https://www.legislation.gov.uk/uksi/2016/362/schedule/11/part/6/paragraph/9 (the official version)
Page: https://openlegislation.uk/traffic-signs-regulations-and-general-directions-2016/schedule-11/part-6/paragraph-9
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.