Danger Signals (Visual and Acoustic)

Visual danger signals (such as information signs, safety colours, luminous and verbal as well as manual signals) or acoustic danger signals (i.e. alarms) have to meet the following requirements:
  • The message must be clearly understandable, and any possible confusion must be eliminated.
  • An optimum effect is to be achieved through the type, sequence, scope, number, location, functions and design of such signals.
  • Visibility and audibility must not be impaired (i.e. ambient noise affecting acoustic signals).
  • It must also be possible for workers with impaired hearing or vision (also resulting from personal protective equipment) to perceive these signals. See also Emergency Signals.