# The Traffic Signs Regulations and General Directions 2016, Paragraph 2

Extent: E+W+S

The flashing amber lamps provided for at item 11 for display on a gantry, or over a traffic lane or hard shoulder, with a sign provided for at item 1, 2 , 4, 8, 9 or 10 must operate such that—
(a) each lamp shows an intermittent amber light at a rate of flashing of not less than 60 nor more than 90 flashes per minute; and
(b) one horizontal pair of lights is always shown when the other horizontal pair of lights is not shown.

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Source: https://www.legislation.gov.uk/uksi/2016/362/schedule/15/part/4/paragraph/2 (the official version)
Page: https://openlegislation.uk/traffic-signs-regulations-and-general-directions-2016/schedule-15/part-4/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.