Oh for the love of christ, why?! Bikes can travel almost noiselessly, so why would you make it a requirement for electric cars to make extra noise, since the absence of noise cannot be a cue to step into the road.
because visually impaired people rely on their hearing to avoid getting run over?
as a cyclist it's pretty useful to be able to hear cars approaching from behind as well, no?
as do;
bmw - https://www.youtube.com/watch?v=cKSmr9gW8dE
nissan - https://www.youtube.com/watch?v=yJTc6ZrODOY
the regs kick in frim july 2019 in the EU and apply to electric vehicles with four or more wheels.
https://newatlas.com/eu-ev-acoustic-noise-avas/60022/