Just before 3 p.m., Maine State Police responded to a report that the truck that had gone off the road on the southbound lane of I-95 in Oakfield.
When troopers arrived, they discovered the tractor trailer had left the interstate and flipped onto it s passenger side.
The driver Herman Long, 75,as not wearing a seat belt at the time and was ejected from the vehicle. Long had serious but non life-threatening injuries.
Houlton Fire and Ambulance, Oakfield Fire, Maine DOT and troopers from the state police commercial vehicle unit were also on scene to assist.
The cause of the crash remains under investigation.