FAIRFIELD, Maine — A Bangor man suffered life-threatening injuries after the van he was driving struck the back of a tractor-trailer on Interstate 95 in Fairfield on Saturday morning.

State police said Kenneth Billings, 56, was taken to Maine Medical Center in Portland after the crash, which occurred at 7:48 a.m. Saturday in the southbound lanes of I-95. Cpl. Diane Vance said late Saturday afternoon she did not have any information about the condition of the driver.

According to witnesses, Billings’ green 1998 Mercury Villager van was being driven erratically and at high speed before the crash. Billings was alone in the vehicle.

Truck driver Mason Markley, 40, of Danielson, Connecticut, had just come on to I-95 at the Fairfield exit with a load of paper products bound for Arizona when the crash occurred, Vance said. At first, Markley thought he had gotten a flat tire before he realized he was dragging a van behind him, she said.

One lane of I-95 was closed for four hours and reopened early Saturday afternoon, while agencies including the Maine State Police, the Fairfield Police Department, the Waterville and Fairfield Fire Departments, Delta Ambulance, Commercial Vehicle Enforcement worked to clear the scene. The crash, which remains under investigation, was reconstructed and forensically mapped by Maine State Police officials, Vance said.

Portland television station WGME, CBS 13, contributed to this report.