Why did they change the police siren?
police siren with lights can use in different fields with different cop siren sounds.
8 different Tones of sirens, Airhorn, Hi-Lo, HyperLo, HyperYelp, ManualWail, Wail, Whoop, Yelp changing the police sirens sounds in different situations to pay your attention.
Two main reasons for making sounds or the siren:
Firstly, when all emergency vehicles are in the same signal, the driver couldn’t distinguish tasks of other emergency vehicles, and unable to recognize each sound, and may cause a collision at the corner.
so different sounds have a better avoidance effect. For example, when a police vehicle hears an ambulance sirens sound, will avoid it automatically.
Secondly, the siren sound is different for different applications, so the sound of the siren sound and frequency is not the same. The purpose is to distinguish the siren from the noisy environment, bring a better avoidance effect.