Why rush replacement of N.Y.'s fracture-critical Tappan Zee?

01/29/2012 | Bloomberg

The fact that New York's fracture-critical Tappan Zee Bridge is among 8,000 structurally deficient spans in America was one unspoken reason why President Barack Obama sought to expedite construction of its replacement. "Their fracture-critical nature means they don’t give any warning at the point of collapse. It is sudden and catastrophic," said Thomas Fisher, dean of the College of Design at the University of Minnesota.

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