# The Traffic Signs Regulations and General Directions 2016, Paragraph 3

Extent: S

In respect of items 1A and 2A, each lamp incorporated into the sign must show an intermittent amber light at a rate of flashing of not less than 60 nor more than 90 flashes per minute, and in such a manner that the lights of one horizontal pair are always illuminated when the lights of the other horizontal pair are not illuminated.

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Source: https://www.legislation.gov.uk/uksi/2016/362/schedule/8/paragraph/3 (the official version)
Page: https://openlegislation.uk/traffic-signs-regulations-and-general-directions-2016/schedule-8/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.