6.—(1) This paragraph applies where, by virtue of the variation permitted in paragraph 2, the traffic light signals provided for at item 1 or 3 of the Part 2 sign table includes a light signal provided for at items 2 to 7 of the Part 3 sign table (which relate to light signals for controlling tramcars).
(2) The order of illumination for the light signal must be as follows—
(a)the horizontal line (item 3);
(b)the vertical or a diagonal line (items 4 to 6);
(c)the central circle (item 7).