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Over 80,000 U.S. bridges "functionally obsolete"

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Over 80,000 U.S. bridges "functionally obsolete"

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Over 80,000 U.S. bridges "functionally obsolete"

by CBSTV Videos 3:04 mins

Mark Rosenker, chairman of the NTSB during its investigation into the collapse of the I-35 bridge in Minneapolis, and a CBS News transportation safety expert, talks to the "CBS This Morning" co-hosts about America's infrastructure problem.

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