7.—(1) The following legends may 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 provided for 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 sign on which it is displayed.
(3) In the legends provided for in paragraphs (a) and (d) of sub-paragraph (1), the letter shown in square brackets may be omitted.