Under British and European legislation, all safe procedure signs must be square or oblong with a white symbol or symbol and text on a green background. These may be supported by supplementary signs of the same design and colour.
What Safe Procedure Signs Should I Use?
Safe procedure signs should be situated as to indicate exit routes. At least one sign should be visible from any place within the building.
British standard style signs have symbols and text; European standard styles have just symbols. It is advised not to mix the two styles.
To avoid confusion, it is also advisable to have “final exit” signs at external exit points. These should have a running man symbol and text, but no arrow.