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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.

United Kingdom

Original text. Later amendments are not shown.

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.