Part of the Pennsylvania Turnpike's Northeast Extension remains closed Thursday morning because of the incident.
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The beam fell inside the Lehigh Tunnel around 6 p.m. Wednesday.
The Lehigh County coroner said Howard Sexton, 70, was pronounced dead at the scene.
NJ man killed after beam falls in Lehigh Tunnel
The coroner said Sexton, of Mickleton, New Jersey, was driving a tractor-trailer when a metal conduit fell from the tunnel, broke through the truck's windshield and hit him in the head.
Remarkably, the tractor-trailer continued southbound out of the tunnel for a distance of a mile before coming to a stop along the highway.
Initial police activity focused on other vehicles in the tunnel that sustained only minor damages.
Sexton's body and his truck were not found for about three hours. Police said it was located only after Raymour and Flanagan's requested a welfare check on the driver.
The crash closed the southbound lanes of the highway from Mahoning Valley to Lehigh Valley, causing a major traffic backup Wednesday night.
The southbound lanes remained closed overnight while Turnpike officials worked to repair the beam.
The turnpike authority said the tunnel was last inspected in September 2016. It would not say if there had been any recent work done in or around the area where the materials fell.
Traffic is now able to get through both ways in the tunnel using the northbound lanes. Around 8 a.m., crews opened the northbound lanes to two-way traffic while officials continue to work in the southbound lanes.
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Earlier Wednesday, several trucks were involved in a collision on the Northeast Extension in Bucks County.
NE Extension reopens after serious crash in Bucks Co.
It happened shortly after 10 a.m. in the northbound lanes in Milford, Pa. between the Lansdale and Quakertown exits.
It took nearly four hours for crews to clear the damaged vehicles from the scene.
All lanes were back open by 2:30 p.m.
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Crash on Pa. Turnpike Extension
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