ANNEX I GENERAL MINIMUM REQUIREMENTS CONCERNING SAFETY AND/OR HEALTH SIGNS AT WORK

5. The effectiveness of a sign must not be adversely affected by:

5.1. the presence of another emission source of the same type which interferes with visibility or audibility; therefore, in particular,

5.1.1.

the placing of too many signs too close together should be avoided;

5.1.2.

two illuminated signs which are likely to be confused are not to be used at the same time;

5.1.3.

an illuminated sign is not to be used in the proximity of another similar illuminated source;

5.1.4.

two acoustic signals are not to be used at the same time;

5.1.5.

an acoustic signal is not be used if there is too much ambient noise;

5.2. poor design, insufficient number, incorrect positioning, poor state of repair or incorrect functioning of the signs or signalling devices.