The noise will only be activated at less than 20km / h. A new rule passed in the European Union will require that all electric cars produced from this Monday, July 1, make some noise, says the BBC. This artificial noise should only be emitted when the car is driven at low speeds, in particular at less than 20km / h. The aim is for the noise to alert pedestrians and cyclists in public spaces not to be caught unawares. The rule will become mandatory in all electric vehicles from 2021 and, of course, has been met with criticism by those who advocated the use of electric cars as a way to combat noise pollution.