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I have been thinking about how they might have gotten it shut down in time. My guess would be the port has access to the emergency radio that sent out a broadcast to all emergency services which police or highway officials at the ends of the bridge heard and shut it down.
Baltimore Key Bridge collapse updates: One body recovered during ongoing search
Francis Scott Key Bridge collapsed into the Patapsco River in Baltimore after a cargo ship crashed into it Tuesday morning
www.independent.co.uk
This article states they were able to get the signals to the right people to get the traffic off the bridge. What a miracle.
Additionally at this point they have 3 people recovered, 1 is in the hospital, 1 body, and I believe 6 still missing (but not sure if that counts the ones already found or not).