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There are a number of reasons why police siren is so critical for law enforcement. A police siren signals an approaching police car, indicating that help is at hand. It is also used to clear the road ahead when rushing to a call. Police sirens are also useful to indicate to a driver to pull over in case of any infringement of law. Emergency vehicles have different siren sounds so that the presence of a fire-truck, an ambulance or a police car can be distinguished by the people at large. If all emergency vehicles had the same siren, they would find it difficult to distinguish between each other’s sirens. This can lead to crashes which are sometimes referred to as a wash-out effect. There are two common sounds that emanate from a police siren box in the USA. One is the wail which is the traditional sound that also denotes the speed of the car. The other is the yelp that has an increasing and decreasing pitch, thereby catching the attention of the people at the site of an incident or...

The role of police sirens is critical in alerting pedestrians and people on the road of the presence of a police vehicle. Indeed, it is not only to warn drivers on the road only but also people on the sidewalks too. For instance, a police vehicle might be in pursuit of a rogue car at high speed with the sound of the siren acting as an indication for people on the sidewalks not to get down on the main road. The sound from a police siren speaker is often changed to get the maximum attention. Police officers generally use the “wail” sound when they are on the highway. Once they face heavy traffic at intersections or crowds, they switch to the “piercer” tone, so called because the sound pierces through the senses of people. The latest in police car sirens is the “howler” function which operates at low frequency and alerts drivers miles in front to move out of the way. In a nutshell, then, police sirens are used in a wide range of circumstances. Their primary function is to inform peop...