Why do all EVs make the same quiet hovering sound when they drive ?
In: Engineering
EVs are required by Federal regulation to “make noise” at lower speeds because totally silent vehicles would lead to pedestrian unawareness. Many pedestrians — especially those with visual disabilities — rely (consciously or unconsciously) on sound to be aware of nearby, slow-moving vehicles on streets.
To maintain this awareness, fully-electric vehices usually [emit artficial noise](https://www.usatoday.com/story/money/cars/2024/09/06/electric-car-sound-inspirations/74908203007/) — which is probably what you’re identifying as the “hovering sound” — at speeds below 25 mph to comply with regulations.
At higher speeds, tire-on-pavement sounds and wind sounds serve that need. I believe the regulation only requires the artficial sounds at low speeds.
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