A safety investigator probing the Minneapolis highway bridge collapse said Friday that existing state and federal design review processes may not be adequate to detect design errors.
Joseph Epperson told the National Transportation Safety Board that neither Minnesota nor federal officials detected a design error on the Interstate 35W bridge span.
Back in the 1960s, when the Interstate 35W bridge was erected, Epperson said, the federal government and the states relied on the seal of the engineer who signed off on the project. The engineer for the Minneapolis bridge is deceased.
The five-member board plans to vote later Friday on the probable cause of …
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