# Traffic Signs (Temporary Obstructions) Regulations (Northern Ireland) 1999, Regulation 13: Warning lamp


A warning lamp shall consist of a device which—
(a) shows an intermittent amber light having a flashing rate of not less than 55 nor more than 150 flashes per minute; and
(b) is illuminated by either—
(i) a single source of light; or
(ii) two or more sources of light mounted adjacent to each other and flashing in such a manner that all the sources of light are illuminated or extinguished simultaneously.

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Source: https://www.legislation.gov.uk/nisr/1999/121/regulation/13 (the official version)
Page: https://openlegislation.uk/traffic-signs-temporary-obstructions-regulations-northern-ireland-1999/regulation-13
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.