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4.—(1) If horizontal or vertical scrolling displays are used—
(a)any station names (which may be abbreviated) and any other complete words or messages must be displayed for a minimum of 2 seconds; and
(b)horizontal scrolling displays must have a scrolling speed not exceeding 6 characters per second.
(2) In displays, ascenders and descenders must have a minimum size ratio of 20% to upper case characters.
(3) In this paragraph—
(a)“ascender” means that part of any of the letters b, d, f, h, i, j, k, l or t which protrudes above the height of other letters;
(b)“descender” means that part of any of the letters g, j, p, q or y which protrudes below the level of the base of other letters; and
(c)“other letters” means the letters a, c, e, m, n, o, r, s, u, v, w, x and z.
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