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Thousands of bridges at risk of freak collapse | Fox News: "Major roadways used by thousands of U.S. drivers cross over "fracture critical" bridges -- a term meaning that if a single, vital component of the bridge is compromised, it is at risk of collapse."
"Because the bridge's key structures lacked redundancy, where if one piece fails, there is another piece to prevent the bridge from falling, when the gusset plate broke, much of the bridge collapsed."
Saturday, May 25, 2013
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