# The Traffic Signs Regulations and General Directions 2016, Paragraph 55

Extent: E+W+S

The permitted variants are—
(a) the relative position of the number and “SOS” may be reversed;
(b) a flashing white light may be added to the sign.

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Source: https://www.legislation.gov.uk/uksi/2016/362/schedule/11/paragraph/55 (the official version)
Page: https://openlegislation.uk/traffic-signs-regulations-and-general-directions-2016/schedule-11/paragraph-55
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.