In context, this is referring to sound: The National Highway Traffic Safety Administration said in a research report last year that hybrid vehicles are twice a

In context, this is referring to sound: The National Highway Traffic Safety Administration said in a research report last year that hybrid vehicles are twice as likely to be involved in pedestrian crashes at low speeds compared with conventional vehicles. The study looked at circumstances in which vehicles were slowing down or stopping, backing up or entering or departing a parking space. And for sheer quantities: Nearly 4,100 pedestrians were killed and 59,000 were injured in 2009, according to the most recent data available. And for how the blind themselves feel, rather than our guesses: Blind pedestrians have pushed for the changes, saying the quiet purr of hybrids can pose risks for them because they use sound cues to travel safely. http://www.mnn.com/green-tech/transportation/stories/hybrid-cars-should-be-seen-and-heard-congress-says http://www.mnn.com/green-tech/transportation/stories/hybrid-...