ABSTRACT
Safety barriers are the measures which are selected after the risk-reducing solutions have been established, with the purpose of reducing the likelihood of failures and hazards, preventing accident situations from developing and limiting the possible harm caused by an unwanted chain of events. Safety barriers are established to reduce the likelihood of the development of an unwanted chain of events when an initiating (triggering) event has already occurred, i.e. a hazard scenario has already started. The main and only function of a barrier is a safety function that is required on demand.
