My wife retired from the MI branch of a large St. Paul insurance company. Her thoughts immediately went to wondering about the people she worked with that would have been in the afternoon traffic jams.. Charlie - glad you are safe ! We'll be keeping all of the people affected by this tragedy in our prayers.
Has anyone heard mention of the Mythbusters episode of a few months ago in which they set up a vibrating weight to synchronize with the natural resonant frequency of a steel bridge? They didn't have much success at first, but at the end, they were able to set a bridge to shaking with a relatively small amount of weight. A friend today said that when he was in basic training in the mid-60's, troops were taught not to march in step on bridges....... I'm sure that NHTSA and all of the academics will figure this out in time, but meanwhile the affected families will be wondering if this was poor bridge inspections, a freak accident caused by several dynamics or ?????