# The Traffic Signs Regulations and General Directions 2002, Paragraph 6

Extent: E+W+S

(1) The following legends may also be displayed on a variable message sign—
(a) “SIGNAL[S] UNDER TEST”;
(b) “SIGNAL TESTS FOR” and a number of “MILES”;
(c) “SIGNAL TESTS ON SLIP ROAD”;
(d) “SIGN[S] UNDER TEST”;
(e) “END OF SIGNAL TESTS”;
(f) “END OF SIGN TESTS”.
(2) The legends specified in paragraphs (a) to (d) of sub-paragraph (1) may be displayed with a pattern which has no particular meaning but which is designed to test the functioning of the variable message sign on which it is displayed.
(3) In the legends specified in paragraphs (a) and (d) of sub-paragraph (1) the letter shown in square brackets may be omitted.

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Source: https://www.legislation.gov.uk/uksi/2002/3113/schedule/15/paragraph/6 (the official version)
Page: https://openlegislation.uk/traffic-signs-regulations-and-general-directions-2002/schedule-15/paragraph-6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.