Engineers and safety officials have been worrying for years about America's infrastructure, including its many long-neglected bridges. Former NTSB chairman Mark Rosenker discusses what the U.S. needs ... more 
Engineers and safety officials have been worrying for years about America's infrastructure, including its many long-neglected bridges. Former NTSB chairman Mark Rosenker discusses what the U.S. needs to do to get up to par. less 
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Sat, May 25, 2013 10:01 AM EDT