U.S. Sen. John Kerry is trying to make sure hybrid and electric cars aren't too quiet. Kerry is pushing a proposal aimed at helping protect blind pedestrians who rely on their hearing to safely cross streets. The proposal would authorize the U.S. Secretary of Transportation to establish a minimum sound requirement for hybrid and electric vehicles to alert pedestrians to their approach. The Senate Commerce Committee has passed the plan, which Kerry first introduced last year. Kerry pointed to a study that he said found hybrid electric