Why do police, ambulances and fire engines use different sounding sirens? The ones I can think of are the slow rising/falling wail, the much faster yelping sound and then a really fast, irritating one they do in short bursts. Also, are they controlled by the passenger?
2007-11-17 05:55:34 · 15 answers · asked by YourLocalGP 2 in Cars & Transportation ➔ Safety
It's at the driver/passengers behest as to which one is used. Usual practice is for the long rising & descending wail to be used for the "open road" as it seems to reach better, then the yelp in higher traffic areas to penetrate the noise of traffic and that horrible indescribable noise to be used at junctions as it is easier to detect exactly what direction that noise comes from. As far as I am aware, nearly all emergency vehicles are now fitted with basically the same equipment, with the sounds selected by switch on the dash.
2007-11-18 18:36:15 · answer #1 · answered by champer 7 · 0⤊ 0⤋
Ultimatly they are to get your attention, and around here almost every department {police,fire,ambulance,sherrifs,etc} all get there sirens from "Galls". So everyone is capable of making the same sounds. Our SOP's are that the passanger operates the siren and covers all radio traffic and the driver DRIVES. If there is no second person then the driver is on his own. But what good is a fire truck or ambulance with out at least two people? You get to the scene but can't do squat after that untill help arrives. Our fire trucks have a foot petal in the passengers footwell for the air horn activator used for intersections.
2007-11-18 02:34:06 · answer #2 · answered by Anonymous · 1⤊ 0⤋
Here is why i think they do: Its probably for the safety of other drivers. If you live in a major city center such as London, New York, Toronto you will probably constantly hear sirens in the distance. A driver might hear the siren but not realize that the emergency vehicle is right behind them or about to run a red light. If the alternate it will keep the driver alert.
2016-05-23 23:55:40 · answer #3 · answered by ? 3 · 0⤊ 0⤋
They are firstly to differentiate between the the emergency vehicles because Fire Engines need most clearance, ambulance next less and Police cars the least, the short bursts are to get vehicles that seem oblivious to them out of the way, the long wailing one is too warn vehicles and can be heard over a long distance, there is one that vehicles use in London that is intended to confuse people as to the direction that the vehicle is coming from it is only used by the Police and involves the short bursts that are yelps and whines and also some high pitched wailing.
2007-11-17 06:08:01 · answer #4 · answered by Anonymous · 1⤊ 4⤋
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2016-04-25 17:42:34 · answer #5 · answered by ? 3 · 0⤊ 0⤋
Different Types Of Ambulances
2016-11-03 00:06:49 · answer #6 · answered by Anonymous · 0⤊ 0⤋
The driver controls the siren. When you hear the high pitch yelp we use that for intersections and high traffic areas. We change the tones or sounds as no every boby hears the same tones.
2007-11-17 06:06:37 · answer #7 · answered by flamingo 2 · 1⤊ 0⤋
The "really fast, irritating one they do in short bursts" is a white noise generator.
'White noise' (a static-like hiss) is directional, meaning you can tell which direction it's coming from. Most people can't actually tell WHERE a siren is coming from, especially when the roads are busy. The human ear can detect where white noise is coming from, better than other sounds.
Another one you'll hear are 'junction horns'. These are loud klaxons, that sound like foghorns, used when ambulances are approaching busy intersections.
2007-11-17 17:11:08 · answer #8 · answered by Nightworks 7 · 0⤊ 1⤋
The different sounds are to let you know which one is coming. The sirens can either be controlled my the passenger or the driver, it's just a lever/button/toggle switch.
2007-11-17 12:02:40 · answer #9 · answered by muzacmaster44 3 · 1⤊ 0⤋
Different sirens for different traffic conditions and they can be operated by both the driver or front seat passenger.
In my time it was just a bell, made the horses jump.
2007-11-17 06:03:28 · answer #10 · answered by firebobby 7 · 1⤊ 0⤋