I did not know this...
"Vehicles capable of operating silently are required by law to emit sounds at speeds up to 19 mph to alert pedestrians to the vehicle's presence. "
www.cnet.com
"Vehicles capable of operating silently are required by law to emit sounds at speeds up to 19 mph to alert pedestrians to the vehicle's presence. "

NHTSA to EV Drivers: No Selectable Low-Speed Sounds for You
The government received a number of comments both for and against driver-selectable low-speed EV sounds.
