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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.
The use of flashing lights and sirens is colloquially known as blues and twos, which refers to the blue lights and the two-tone siren once commonplace (although most sirens now use a range of tones). In the UK, only blue lights are used to denote emergency vehicles (although other colours may be used as sidelights, stop indicators, etc.).
A civil defense siren is a siren used to provide an emergency population warning to the general population of approaching danger. Initially designed to warn city dwellers of air raids ( air-raid sirens ) during World War II , they were later used to warn of nuclear attack and natural disasters , such as tornadoes ( tornado sirens ).
Blue emergency lights may only be used when performing a stop on a vehicle or when the vehicle is stationary at a scene. Response - police officers are permitted to drive intermediate-powered vehicles up to approx. 200bhp, utilising blue lights and sirens for emergency response whilst claiming exemptions.
According to Al "Buddy" Kirsits, director of the county's Emergency Management Agency, the sirens are more than just tornado sirens. "They're an early warning outdoor siren system," he said Monday.
Heath Siren This page was last edited on 20 February 2025, at 19:46 (UTC). Text is available under the Creative Commons Attribution-ShareAlike 4.0 License ...
In fact, the state’s vaunted integrated outdoor siren warning system – the largest in the world, with about 400 alarms – was not activated during the fires, according to Hawaii Emergency ...
The Emergency Alert System (EAS) is a national warning system in the United States designed to allow authorized officials to broadcast emergency alerts and warning messages to the public via cable, satellite and broadcast television and AM, FM and satellite radio.