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Oliver Schick
https://www.youtube.com/watch?v=oLwf4_bXOc0
This is a pretty well reasoned look at what might have caused it. He speculates that the design of the bridge itself was a major factor: it has very few stays which makes maintenance hard, bridges aren't built like this any more. Plus extraordinary load on the bridge: high traffic over a holiday period and extreme weather.
All guesswork really until a proper engineers report is done but it's an interesting video.