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A siren is a loud noise-making device. There are two general types: mechanical and electronic. Civil defense sirens are mounted in fixed locations and used to warn of natural disasters or attacks. Sirens are used on emergency service vehicles such as ambulances, police cars, and fire engines.
Whoever receives distress signals, should confirm and alert the emergency services. The distress signal can also be a sound, light, or visible signs: Audible signals: e.g. loud calling, whistles, yodeling (Deep tones are audible over a long distance.) Optical signals: e.g. flashlights, blinkers, sunlight mirrors, flares, flames
This signal is used if a public emergency is imminent. All clear: A 100-second alert to be used after a public emergency has been dealt with. The all clear is mainly used during the nationwide siren testing in Argentine Volunteer Firefighters' Day, in the 2nd of June and sometimes, in some sirens, the general warning is tested after the all-clear.
Union County Sheriff Mark Sheriff made the ceremonial first call and dispatch responded with the code for "loud and clear" on the county's new $7.2 million emergency communications system during ...
The PASS device sounds a loud (95 decibel) [1] audible alert to notify others in the area that the firefighter is in distress. On a fireground, the sound of an activated PASS device indicates a true emergency and results in an immediate response to rescue the firefighters in distress.
Train horns are sounded where a whistle post (marked with the letter "S" for siffler – "to whistle") is present. If the whistle post is labelled "J" (meaning jour – "day"), the horn is only to be sounded between 07:00 and 20:00. Horns must also be sounded when passing an oncoming train, and shortly before reaching the last car of the train.
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