[TulliusCicero]

No that's silly, sorry.

How do you see that actually panning out? Convince every fire and police department to retrofit every vehicle in their fleet before you have SDC's in the area? What if you want to launch to consumers in general, do you need to convince every police and fire department in the whole country?

Humans can detect emergency vehicles coming by the sound of the sirens. It's definitely possible for machines to do the same.