BOSTON (WHDH) - A Boston Water and Sewer Commission worker was hospitalized after a dump truck rolled over inside the Thomas P. O’Neill Tunnel in Boston on Monday morning, causing lengthy delays for commuters.

The dump truck rolled over just after exit 23 northbound around 8 a.m., sending gravel across all lanes of the highway.

Crews worked for more than an hour removing the gravel before all lanes were reopened around 9:45 a.m.

The driver, a 30-year-old Mattapan man, was taken to Massachusetts General Hospital with non-life-threatening injuries.

The crash resulted in delays of nearly two hours on Interstate 93 from the Braintree Split to the Tunnel.

7NEWS videographer Dave Heikkila got stuck in the traffic, describing it as “unbelievable.”

“Once you hit about the Dorchester line, standstill,” he explained. “Complete standstill.”

The road reopened around mid-morning.

The cause of the crash remains under investigation.

This is a developing news story; stay with 7NEWS on-air and online for the latest details.

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