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The new rule requires all newly manufactured electric vehicles 10,000 pounds or less to make an audible noise when traveling forward or in reverse at speeds 19 mph or less. NHTSA says the sound alert is not required at higher speeds because other factors, such as tire and wind noise, “provide adequate audible warning to pedestrians.” It doesn’t explain what kind of alert automakers use, so whether it’s a fake engine noise or a “beeping” noise will be up the manufacturers of electric vehicles.

Source: Electric cars are now required to make noise at low speeds so they don’t sneak up and kill us – The Verge