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Warning system

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There are 8,200 alarm sirens for civil protection throughout Switzerland. They are tested once a year, on the first Wednesday in February.[1] About this sound Sound sample 
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Warning light indicating danger of laser exposure

Warning system is any system of biological or technical nature deployed by an individual or group to inform of a future danger. Its purpose is to enable the deployer of the warning system to prepare for the danger and act accordingly to mitigate or avoid it.

Biological warning systems

Man-made warning systems

Civilian warning systems

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A fire alarm that warns people if a building is on fire

Military warning systems

Historical beacon-based systems:

Space based missile early warning systems:

Airborne early warning systems:

Ground based early warning radar systems:

Optical sensors:

Emergency broadcasting:

See also

Notes and references

  1. ^ Testing sirens, Swiss Federal Office for Civil Protection (page visited on 7 September 2013).
  2. ^ [1][dead link]
pl:System wczesnego ostrzegania