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Thousands of bridges at risk of freak collapse

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SEATTLE (AP) -- Thousands of bridges around the U.S. may be one freak accident or mistake away from collapse, even if the spans are deemed structurally sound. The crossings are kept standing by engineering design, not supported with brute strength or redundant protections like their more modern counterparts. Bridge regulators call the more risky spans "fracture critical," meaning that if a...