These cars do not emit sounds when driving are their technical features. Therefore, the American Institute of road safety ordered these machines make noise when driving. All manufacturers of electric vehicles and hybrids must be installed on your products special device that simulates the sound of the engine. Now pedestrians simply do not notice the approaching vehicle, and therefore may end up under his wheels. And since July of next year in the United States will come into force a law prohibiting vehicles to move silently along the roads. Ford started in advance to prepare for the new law. On the company page in Facebook everyone can vote for the best sound, simulating the operation of the engine. The winner can be heard on the electric Focus, the output of which is scheduled for the end of this year. Two years ago, the UK government raised this issue. Electric cars and hybrids offered to "voice" and the music and the voices of animals. While experts still tend to the usual hum of the conventional engine.