The Philadelphia Inquirer reports, “Engineers in Pennsylvania and New Jersey faced a mystery as they investigated the cause of a fractured beam on the Delaware River Turnpike Bridge last month. Poring through more than 50 boxes of records on the bridge’s history, in addition to giving the bridge a close inspection, officials have gathered clues but aren’t ready to announce a cause. The answer could have ramifications across the country for the maintenance of America’s aging infrastructure. Plug welds, used to patch excess holes, are a leading contender for creating a weak point in the beam, officials said.”
