3.—(1) Subject to sub-paragraphs (2) and (3) and to paragraph 7, tank containers and tank wagons used for the carriage of dangerous goods shall display—
(a)an orange-coloured panel, conforming to figure 1, on each side of the tank of the tank container, or the frame of the container on which the tank sits, or on each side of the tank wagon, as the case may be, bearing the UN number and the emergency action code;
(b)the danger sign and subsidiary hazard sign, if any, adjacent to each orange-coloured panel;
(c)the telephone number, in the immediate vicinity of each orange-coloured panel.
(2) Where a number of different dangerous goods, other than those goods specified in sub-paragraph (3), are carried in separate compartments of the same tank container or tank wagon, an orange-coloured panel, conforming to figure 1, (bearing the UN number and the emergency action code), the danger sign, the subsidiary hazard sign, if any, and the telephone number shall be affixed on each side of each compartment of the tank container or tank wagon, parallel to the longitudinal axis of the tank container or tank wagon, so as to be clearly visible.
(3) Where two or more of these goods are being carried in a multi-compartment tank container or tank wagon—
UN 1202 DIESEL FUEL or GAS OIL or HEATING OIL, LIGHT
UN 1203 PETROL or MOTOR SPIRIT or GASOLINE
UN 1223 KEROSENE
paragraph 3(1)(a) shall apply as though the tank container or tank wagon were carrying only one of the dangerous goods listed in the Approved Carriage List; and
any reference in paragraph 3(1)(a) to—
the UN number shall be taken as a reference to the UN number of the most hazardous of the goods being carried, and
the emergency action code shall be taken as a reference to the emergency action code of the most hazardous of the goods present.