If you scroll down the article just after the video, there’s a photo of the top deck after the collapse. There’s a raised area with anchor bolts where the plate for the cable stays was to attach. There is a large cable protruding diagonally out of that raised area. I’m thinking that cable ran through the diagonal web to the lower deck and maybe that’s where the failure occurred. Maybe they were tightening that cable to adjust the camber.
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There obviously was no outside review of this design!
Everything about this thing is beyond unorthodox.