Question: what is the difference between a police siren and an ambulance?
Answer: Police sirens don't have a lot of power, so their sirens tend to not resonate as much as those of an ambulance. The ambulance is generally a bigger vehicle than a police car, and it has more of a reverb to its siren. ... Most cop-cars have the standard car horn, so they don't use it as it's not as loud as the siren.