Different alarm sirens
The main reason for multiple sounds, though, is a little different and frankly a lot more urgent: If all emergency vehicles used the same type, their drivers wouldn't hear each other's sirens while speeding to the same intersection ,
this is known as the wash-out effect and would be more likely to crash into each
do the number of up/down tones mean a different emergency?
eg: 3 times means car accident, 4 times means fire, 5 times means medical, etc? A: No, the siren will sound as long as it does until it is shut off by the first responding firefighter.
