# Council Directive 92/58/EEC of 24 June 1992 on the minimum requirements for the provision of safety and/or health signs at work (ninth individual Directive within the meaning of Article 16 (1) of Directive 89/391/EEC), Division 2.1: If a device can emit both continuous and intermittent signs, the intermittent sign should be used to indicate a higher level of danger or a more urgent need for the requested/imposed intervention or action than is indicated by the continuous sign.

Extent: E+W+S+N.I.

The duration of each flash and the frequency of the flashers of an intermittent illuminated sign must be such as to
ensure the proper perception of the message, and
avoid any confusion either between different illuminated signs or with a continuous illuminated sign.

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Source: https://www.legislation.gov.uk/eudr/1992/58/annex/VI/division/2/division/2.1 (the official version)
Page: https://openlegislation.uk/eu-directive-1992-58/annex-VI/division-2/division-2.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.