I can't speak to how Tesla or Waymo work at that level but I suspect they don't use sound. Even for yourself, it seems as if sound helps you to be aware of some

I can't speak to how Tesla or Waymo work at that level but I suspect they don't use sound. Even for yourself, it seems as if sound helps you to be aware of something that you then look at. If a car can already "see" in 360 degrees and everything already gets the same amount of attention, would sound help?