A jackknifed tractor-trailer temporarily blocked traffic on Route 1 north in Revere, Massachusetts, on Monday morning.
The accident was reported just above Copeland Circle around 6:40 a.m., state police said.
All traffic was stopped for a time as crews worked to remove the tractor-trailer. Heavy backups were reported both northbound and southbound.
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Northbound traffic was diverted past Copeland Circle and back onto Route 1 north.
The road reopened and the scene was cleared just before 10 a.m.
State police said the driver was taken to an area hospital but is expected to survive.
No further information was immediately available.
