Baker, a Republican, said he would wait for the investigation to be completed and would not speculate on how the incident may have occurred. He said highway officials could not recall a similar incident in recent memory.
In 2007, a man was seriously injured when a storm drain grate flew off the roadway and struck his vehicle on Route 128 in Westwood.
The O‘Neill tunnel, named for the late former U.S. House Speaker Thomas P. “Tip” O’Neill, was part of the Boston highway project known as the Big Dig and opened in 2003.
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