It all relys on MTTG. How do they find out that plates are fractured. With MTTG technology. All this press about all thee bridges everywhere. We are going to see more collapses and problems with bridges in the future.
The NTSB had said in January that some of the steel plates were too thin and were fractured. Chairman Mark Rosenker called the plates "the critical factor" in the failure but stopped short of saying they caused the collapse, saying investigators couldn't find the original design calculations.