Metro

Driver cited after truck hits roof of I-93 tunnel, snarling morning traffic

State Police on Thursday cited the Canadian driver of a tractor-trailer that slammed into the roof of the Thomas P. “Tip” O’Neill tunnel in Boston, snarling traffic during the morning commute and damaging at least two other vehicles.

The crash occurred around 6:30 a.m. on the southbound side of the tunnel, and State Police said the truck driver, a 59-year-old man from Ontario, Canada, was cited for “overheight and overwidth [of the] truck. No other violations for driver or vehicle.”

Remarkably, no one was hurt in the crash. The driver works for Snap Trucking in Iroquois, Ontario, officials said.

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A State Police spokesman said it appears the truck “was carrying a piece of filtration equipment.”

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The crash was captured by a MassDOT traffic camera. The video shows the tractor-trailer rushing into the tunnel when the trailer suddenly hits the roof of the tunnel, forcing the tractor into a sudden dead stop. Debris flies from the trailer onto vehicles nearby, and drivers in those cars brake suddenly.

State Police said the incident happened near Exit 20 in the tunnel southbound.

A Snap Trucking dispatcher said that in “26 years of doing this kind of job, we never ran into this problem before.” He declined to provide his name.

Meanwhile, drivers faced long commutes Thursday morning after the crash.

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However, MassDOT and State Police offered some good news to commuters when the agencies reported around 8:25 a.m. that all three southbound travel lanes had reopened, a process that allowed traffic backed up into Stoneham to slowly start easing out.

But the ramp from Lincoln and Essex streets onto I-93 South was closed around 8:02 a.m., according to MassDOT spokeswoman Jacquelyn Goddard, because “debris resulting from [the] truck crash” was moved onto that ramp.

Goddard said in a follow-up message that the ramp had reopened around 9:30 a.m.

MassDOT engineers examined the ceiling and concluded there was no structural damage to the tunnel, Goddard wrote in an e-mail. “MassDOT inspectors found some loose fireproofing material in the aftermath of the truck incident and removed this material,’’ Goddard wrote. “There was no serious damage to the ceiling.”

Travis Andersen of the Globe Staff contibuted to this report. John R. Ellement can be reached at ellement@globe.com. Follow him on Twitter @JREbosglobe.