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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