This appears to be another one of those things that happens that just ain’t right.
No sense exhibited here. Why would anyone put that bridge in place without the important structures for support in place?
Will we get the truth? If not, who is going to be getting the cover up for?
The type of construction and why it failed have been explained in previous threads. There’s nothing truly unique about the design. Something happened when the concrete bridge was in place and the interior tensioning cables were being adjusted possibly to prepare the bridge for further loading. Concrete takes about a month to cure to spec. My guess is that as the concrete continued to cure and develop more strength the tension on the cable was increased. It looks like they were preparing for addition of the remaining structure when something happened.