Special provisions
18. Where the consignment is unpackaged LSA-I or SCO-I for carriage in a freight container, tank container, tank wagon or wagon or the consignment is packaged radioactive material having a single UN number for carriage under exclusive use, the appropriate UN number for the consignment shall be displayed in black digits not less than 65 mm high either—
(a)in the lower half of the danger signs displayed in accordance with paragraph 15; or
(b)on orange-coloured panels conforming to figure 6 in Part III, which shall—
(i)be affixed immediately adjacent to the danger signs displayed in accordance with paragraph 13,
(ii)be affixed in a vertical plane and perpendicular to the longitudinal axis of the freight container, tank container, tank wagon or wagon, and
(iii)be clearly visible.