<p>Traffic authorities have been given 18 months to set a minimum volume for extremely silent cars. The law stipulates warning signals when a vehicle travels at silent low speeds.<br /><br />Associations for the blind have welcomed the regulation which still has to be signed into law by US President Barack Obama.<br /><br />Several electric car makers however offer noise options for buyers that range from the "whoosh" of the Starship Enterprise to a sports-car like roar akin to a Ferrari or Lamborghini.<br /></p>
<p>Traffic authorities have been given 18 months to set a minimum volume for extremely silent cars. The law stipulates warning signals when a vehicle travels at silent low speeds.<br /><br />Associations for the blind have welcomed the regulation which still has to be signed into law by US President Barack Obama.<br /><br />Several electric car makers however offer noise options for buyers that range from the "whoosh" of the Starship Enterprise to a sports-car like roar akin to a Ferrari or Lamborghini.<br /></p>