I think a good artificial noise for electric cars to generate, so they are audible enough for pedestrians and others to be aware of them nearby, would be the synths from Darude's Sandstorm.
@jackdaw_ruiz @mattgrayyes If it was a standard, I'd agree - issue with it at the moment is from a visual impairment issue: each maker chooses their own noise, so unless you know "this is X's noise for a car", it doesn't sound like a car. The one thing ICE vehicles all do is sound roughly the same. *nods*