I’m guessing that there were apartment buildings and/or houses under the bridge.
IIRC from watching the video months ago, it goes over a lot of apartment buildings, factories and roads.
Years ago they tried repairing a 14-story skyscraper in Seattle. They spent millions attempting repairs, then ended tearing the entire thing down.
Somebody didn’t do their job of dabbing a bit of epoxy at the ends of the coated rebar where they had been cut. They started rusting from the ends. And of course the company inspector, city and probably one more guy also missed that or didn’t do their jobs as inspectors.
The building was 8 years old.
So TSR got it, quick search shows the bridge was built through apartment complexes and other buildings. Pillars literally cutting through edges of these buildings....