A group called “vision42″:http://www.vision42.org/ has proposed making the entire length of 42nd Street in New York City car-free. The existing street would become a pedestrian area with a light rail line down the center.
As the New York Times points out, “the idea is not new”:http://www.vision42.org/news/articles/041805_nytimes/, but it seems like this time it may have a better chance of succeeding. The group is organized and thorough, and the city is hoping to improve its chances for the 2012 Olympics.