State police say 55-year-old Harold Hoyt was driving south on the interstate just before 3o’clock Thursday afternoon, when his tractor trailer suddenly drifted off the highway near the Carmel/Winterport exit.
The truck went down into the median and struck a tree, causing the rig to roll over.
Police believe Hoyt was already dead by the time rescuers arrived.
Now they’re trying to figure out why it happened. Troopers say it was not snowing at the time of the crash. Investigators will consider whether the man suffered some sort of a medical condition or fell asleep at the wheel.
Police say Hoyt was not wearing a seatbelt.
He lived in the town of Hoyt, New Brunswick.
The big rig was still in the medians of Thursday night: police say it should be cleared away sometime Friday.