CHARLTON, MASS. (WHDH) - State police are investigating an early morning crash in Charlton that claimed the life of a 51-year-old Springfield man.

Troopers responding to a reported motor vehicle crash on the westbound side of the highway about 3:40 a.m. found a 2017 Ford Transt van that had crashed in the back of a 2013 Freightliner tractor-trailer that was stopped in traffic in a construction zone, according to state police.

The driver of the van, whose name was not released, was pronounced dead at the scene.

The operator of the tractor-trailer, a 58-year-old Chicopee man, was uninjured in the crash.

A preliminary investigation indicates the van driver didn’t realize that traffic had stopped and crashed into the trailer at highway speed.

The crash triggered a massive backup as a state police collision analysis team worked to determine the cause.

The crash scene has since been cleared, though residual delays are expected to continue this morning.

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