the Us road safety agency has requested that electric cars need to keep some sort of sound moving slowly, so the sound serves as a warning to pedestrians.
NHTSA-the agency said the rule will come in handy, because electric cars are very quiet, told the BBC.
according to the Agency rule would be especially helpful for blind pedestrians or people who have vision problems.
the Sound would help them to detect road-going electric cars.
NHTSA believes the new safety provision to prevent up to 2 400 injuries annually.
the Order requires that cars need to keep sound from passing through either forward or backward less than 30 km/h speed.