How about requiring motor manufacturers above a certain wattage to add acoustics to their design in the same way that electric cars are/will be required to make noise at low speeds?
Of course under such a hypothetical requirement, I would hope my 250w mid drive would be excluded so that I can...
I have a FLX attack (full suspension mtb) on order since September which should be arriving in a few weeks. I'll post my opinion on this forum once I have a chance to try it out.
-Neil