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] 
Sound sample (help·info)
Sound sample (help·info)
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
- Aposematism (e.g. warning coloration)
- Climate canary
- Fear
- Miner's canary
- Pain
Man-made warning systems
Civilian warning systems
A fire alarm that warns people if a building is on fire
- Alberta Emergency Public Warning System
- Automatic Warning System
- Child abduction alert system
- Dam safety system
- Earthquake warning system
- Emergency Alert System (EBS) (United States)
- Famine Early Warning Systems Network
- Federal Civil Defense Authority
- Fire alarm system
- Gale warning
- Ground proximity warning system
- Indian Ocean Tsunami Warning System
- International Early Warning Programme
- J-Alert (Japan)
- Lane departure warning system
- National Severe Weather Warning Service
- N.E.A.R. (National Emergency Alarm Repeater)
- North Warning System
- Standard Emergency Warning Signal
- Traffic Collision Avoidance System
- Train Protection & Warning System
- Tsunami warning system
Military warning systems
Space based missile early warning systems:
- Defense Support Program (United States, to be succeeded by the "Space-Based Infrared System")
- Space-Based Infrared System (SBIRS) (United States)
- Oko, also known as "SPRN" (Russia)
Airborne early warning systems:
- Airborne Early Warning and Control ("AWACS" for NATO, many countries have developed their own AEW&C systems)
Ground based early warning radar systems:
- Ballistic Missile Early Warning System and PAVE PAWS (United States)
- Duga-3, also known as the "Russian Woodpecker" (Russia)
- Dnestr radar (1st generation Russian)
- Daryal radar (2nd generation Russian)
- Voronezh radar (3rd and current generation Russian)
- Chain Home (British, now defunct)
- Chain Home Low (British, now defunct)
- ROTOR (British, now defunct)
Emergency broadcasting:
- CONELRAD (United States, succeeded by the Emergency Broadcast System)
- Emergency Broadcast System (EBS) (United States, succeeded by the Emergency Alert System)
Notes and references
- ↑ Testing sirens, Swiss Federal Office for Civil Protection (page visited on 7 September 2013).
See also
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