The reasons of a warning system failure should be identified and classified. These can help to prevent a recurrence.


Situation: failure of a warning system


Features of a warning system failure.

(1) temporal mode

(2) nature of the failure

(3) underlying cause


Temporal mode:

(1) temporary (for example, a power outage)

(2) permanent (for example, destroyed)


Nature of the failure:

(1) warning covered or masked or otherwise non-functioning (present but not working)

(2) partially or completely removed (not present)

(3) design problem (present and working but ineffective)


Underlying cause of the failure:

(1) environmental conditions

(2) intentional

(3) unintentional (accidental)

(4) mixed (a sign may deteriorate in the environment due to a maintenance decision)


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