A new kind of police siren that emits low-frequency vibrations ... "Infrasound is low frequency sound energy that affects the nervous system and prolonged exposure can lead to progressive medical ...
However, you may have noticed that a fire apparatus like a truck, quint, or engine may have a different siren sound than a police car or ambulance. So, why does a fire truck siren like a Q-Siren ...
A police inspector has told the BBC how he was the first to be tricked by a bird mimicking the sound of a siren. Simon Hills said the two-tone impression had officers believing a car was faulty at ...