The catastrophic collapse of the Francis Scott Key Bridge in Baltimore was the result of its design that had limited redundancies and is similar to other past bridge collapses. Those catastrophic failures were caused by just one weak element (Tampa, Florida and Minneapolis are examples). Built in 1977, as a continuous through truss bridge, the Francis Scott Key Bridge lacked the redundancies found in more modern designs. The cantilever truss is a better design with protective “barriers” that protect the pier (as in the rebuilt Sunshine Skyway Bridge in Tampa).
I am glad there is better bridge design being utilized these days. The ships going under them are vastly bigger than when the key bridge was built.