Regulation 7(3)
SCHEDULE 4 E+W+S (which substantially reproduces the provisions of Annex III of Council Directive 99/92/EC)WARNING SIGN FOR PLACES WHERE EXPLOSIVE ATMOSPHERES MAY OCCUR
Distinctive features:
(a)triangular shape;
(b)black letters on a yellow background with black edging (the yellow part to take up at least 50% of the area of the sign).