The document summarizes the collapse of the Tacoma Narrows Bridge in 1940. It discusses that the original bridge had a revolutionary suspension bridge design but collapsed after only 4 months of use during a windstorm. The central span started oscillating in 55-75 km/h winds and collapsed into the water. The bridge did not have enough strength to withstand the wind-induced oscillations. No one was injured in the collapse. After investigating, engineers determined they did not fully understand building suspension bridges and improved designs with wind tunnel testing for the new bridge.
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