I hope it IS required in the US. In my opinion, all quiet vehicles must emit some kind of universally accepted noise at low speed, ideally corresponding to the

I hope it IS required in the US. In my opinion, all quiet vehicles must emit some kind of universally accepted noise at low speed, ideally corresponding to the said speed. Think of, you know, the children, blind pedestrians, non-blind pedestrians immersed into smartphones, etc. One's personal comfort should not come at expense of other's safety, at least that's the kind of world I would like to live in.