BillM said:
If EVs and ICEs were equally dangerous to pedestrians, then about five people a year in the US would be killed by EVs. NHTSA’s report above claims a quiet EV is 1.18 times as dangerous to pedestrians and 1.5 times as dangerous to bicyclists. That suggests PWS will save about one to two people per year on average in the US.
It seems likely to me that pedestrian inattention is a factor in most pedestrian deaths. Even deaths where the vehicle driver is solely to blame, pedestrian vigilance would, I suspect, have saved many or perhaps even most of them. But with so many pedestrians distracted by their smart phones or wearing earbuds, I think it's a bit of a stretch to simply extrapolate the numbers to assume that a sound warning system would have made a difference. The kind of low, electronic sound emitted by the warning system is not going to do much to alert a pedestrian immersed in their phone.
I'm not saying it won't save some lives, but I sure don't think it's going to be a panacea.