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NTSP isued a press release on March 21, 2018: <a href="https://ntsb.gov/news/press-releases/Pages/NR20180321.aspx">https://ntsb.gov/news/press-releases/Pages/NR20180321.aspx</a> It is widely a description of the ongoing and future work on site. Interesting is one paragraph about the post tensioning of the last diagonal strut. Quote: The investigative team has confirmed that workers were adjusting tension on the two tensioning rods located in the diagonal member at the north end of the span when the bridge collapsed. They had done this same work earlier at the south end, moved to the north side, and had adjusted one rod. They were working on the second rod when the span failed and collapsed.  The roadway was not closed while this work was being performed. This just confirms that post-tensioning done during the collapse. The why is still unanswered. Regards, Volker
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