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The Straits Times
|August 23, 2025
Why do some electric vehicles (EVs) make whirling noises when driving at low speed?
Electric and hybrid vehicles sold in the European Union and the United States have been required to have an acoustic vehicle alerting system for a while now.
The system makes a sound when the vehicle is driving at low speed and when reversing. This is meant to warn other road users that an EV is approaching, although the exact activation speed and sound requirement vary according to jurisdictions.
Otherwise, the only sounds emitted by a moving EV would be the noise from rubber tyres rolling on the tarmac.
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