The National Transportation Safety Board on Tuesday issued a preliminary report on the Feb. 21 accident inside the Lehigh Tunnel, about 70 miles north of Philadelphia.
The report says a 2016 inspection had found the corrosion and that the Pennsylvania Turnpike Commission was in the process of awarding a contract to replace the straps when the accident happened.
Howard Sexton, 70, a Gloucester County, New Jersey truck driver, was killed when the section of conduit struck him in the head.
The NTSB plans to identify a cause in its final report along with safety recommendations.
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