Haven't tried to Google anything but the news reporter said this a.m. on the radio while I was coming back from town, that blind pedestrians cannot hear them coming. he did not cite anyone getting hit. He said manufacturers were considering adding some kind of "noise-maker" to them. I wonder if this is a legit concern or just someone sitting around with nothing left on their worry list.
I can see how it could actually pose a problem. If a electric car is travelling at low speeds, thise tiny tires don't whine much.