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Bridge Safety

In this Saturday, Aug. 4, 2007 file photo, vehicles lie in the rubble of the collapsed I-35W bridge in Minneapolis. The bridge had received a "structurally deficient" designation. The National Transportation Safety Board concluded that the cause of the collapse was an error by the bridge's designers, not the deficiencies found by inspectors. A gusset plate, a fracture critical component of the bridge, was too thin.