It's necessary that vehicles make some noise; sound is very helpful for persons with vision problems
The charity Guide Dogs - which had complained it was difficult to hear low-emission cars approaching - welcomed the change, but said electric vehicles should make a sound at all speeds.
Roads minister Michael Ellis said the government wanted "the benefits of green transport to be felt by everyone" and understood the concerns of the visually impaired.
"This new requirement will give pedestrians added confidence when crossing the road," he added.