Paragraph 21 Display of danger signs and subsidiary hazard signs
Subject to paragraph 22, the danger signs and subsidiary hazard signs required to be displayed by this Schedule shall—
(a)
have sides which measure not less than 250 mm;
(b)
have a line of the same colour as the symbol 12.5 mm inside the edge and running parallel to it; and
(c)
be displayed adjacent to one another and in the same horizontal plane.