Police lights and sirens have their own roles in police vehicles
However, in situations where both need to be used, they work together perfectly, in tandem with each other. In relation to the result that needs to be produced, police lights and sirens are things that supplement each other without a glitch.
Because police lights and sirens are not always used together, the controls for each are separate in most vehicles. Some vehicles will have controls with which both can be activated or stopped together, and also those with which both can be activated and stopped separately. When a police vehicle reaches the site of emergency, the lights and sirens have to be switched off immediately. Sometimes, even while on its way to the site, the vehicle may get intimation that the emergency is over and then it has to immediately switch off its police lights and sirens. Using either, when the vehicle is not going in answer to an emergency, is punishable under the law.
Sirens, though less important than lights, are getting modified in its own way. Some latest police sirens have addenda known as howlers, rumblers, etc. which produce vibrations to alert drivers who are not paying sufficient attention to the surroundings. These sirens produce a sound that is not as strong as the characteristic shriek of emergency vehicles. Instead, they pass vibrations to the other vehicles on the road through the ground, alerting them to the presence of police lights and sirens outside.
One difference between the police light and sirens is that it is easier to direct the light outwards, or in the desired direction, by rotating it or changing its angle. The volume of the siren can also be raised or lowered to suit various requirements, but sometimes vehicles that need to use sirens in a concealed manner might have uncomfortable levels of noise inside. Bad installation can also cause this problem. One way to avoid this is to fix the siren speakers to the front, away from the passenger cabin of the vehicle.
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