farnsworth writes: Tony Alfrey has put together a fascinating page with some history, analysis, and possible explanations for what ultimately went wrong with the recent emergency repair of the San Francisco-Oakland Bay Bridge. The bridge has been closed for days and is not scheduled to open for days to come, hugely inconveniencing more than 250,000 people a day. His analysis touches in possibly poor welding, possibly a fatally flawed kludge, and a the absence of a long-term fix or adequate follow-up by Caltrans, who are responsible for the bridge. This is a great engineering community, what other info do you have?
At the source of every error which is blamed on the computer you will find
at least two human errors, including the error of blaming it on the computer.