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

Extent: E+W+S

If the sign is displayed on a variable message sign and displays its aspects by means of light-emitting characters or symbols, the legend “SLOW DOWN” may be displayed beneath the sign (and any associated plates) in characters having a height of not less than one quarter of the height of the displayed sign.

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Source: https://www.legislation.gov.uk/uksi/2016/362/schedule/2/part/7/paragraph/3 (the official version)
Page: https://openlegislation.uk/traffic-signs-regulations-and-general-directions-2016/schedule-2/part-7/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.