Time to Overhaul America's Aging Bridges?

http://sciencefriday.com/segment/08/31/2012/time-to-overhaul-america-s-aging-bridges.html

Aug. 31, 2012

Five years after the deadly collapse of the I-35W bridge in Minneapolis, experts say nearly 8000 of America's bridges are still in dire need of repair -- including landmark structures like the Brooklyn Bridge.