Warning system
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
Sound sample 
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 Alert
- Alberta Emergency Public Warning System (replaced by Alberta Emergency Alert)[2]
- Automatic Warning System
- Child abduction alert system
- Dam safety system
- Earthquake warning system
- Emergency Alert System (EAS) (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
Historical beacon-based systems:
- Byzantine beacon system in Asia Minor during the 9th century
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)
Optical sensors:
Emergency broadcasting:
- CONELRAD (United States, succeeded by the Emergency Broadcast System)
- Emergency Broadcast System (EBS) (United States, succeeded by the Emergency Alert System)
See also
Notes and references
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Wikimedia Commons has media related to Warning systems. |
- ↑ Testing sirens, Swiss Federal Office for Civil Protection (page visited on 7 September 2013).
- ↑ Archived December 12, 2006, at the Wayback Machine.
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