NEW YORK --- The National Federation of the Blind (NFB) says that hybrid vehicles pose a threat to blind pedestrians because the vehicles are so quiet. When operating on the electric battery at a stop light, blind pedestrians don't hear the car at all. A sudden right turn just after the light changes can prove to be particularly risky if the pedestrian doesn't know the car is there and enters the crosswalk without the driver noticing. Members of the NFB's Committee on Automobile and Pedestrian Safety have discussed asking automakers to add sound cues to help alert pedestrians. One possible solution is to include a device built into the axle that emits a sound as the wheels rotate, according to an article in the Wall Street Journal.