 The Pedestrian Safety Enhancement Act of 2010 was approved by the U.S. Congress in December 2010, and the bill was signed into law by President Barack Obama on January 4, 2011.A proposed rule was published for comment by the National Highway Traffic Safety Administration (NHTSA) in January, 2013.It would require hybrids and electric vehicles traveling at less than to emit warning sounds that pedestrians must be able to hear over background noises.