Hyatt Walkway
The Hyatt walkway collapsed because of poor design, poor construction and most important poor planning. It was designed for a few people to walk over at a time. They didn't know that the Hyatt would hold senior citizen Tea Dances where large groups of people would be on the walkways swaying to the music.
Just like armies don't have soldiers march over a bridge. It creates too much vibration. They are ordered to stroll over.
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