LUDLOW, Maine — State police cited excessive speed, alcohol and drugs as factors in a single-vehicle accident early Saturday in which a Houlton man was seriously injured and remained in critical condition Monday evening.

Jeffrey Hardy, 51, suffered severe internal trauma as well as several broken vertebrae in his neck, according to police.

Trooper Dennis Quint said Monday that Hardy was driving north on French Road in a 1999 Grand Am about 3:15 p.m. when he hit a large dip in the road, lost control of his vehicle and slammed into a bump on the other side.

Quint said that the front of the Grand Am, registered to Hardy’s girlfriend, April Thorsen, had heavy front-end damage and that its windshield shattered and its air bag deployed.

Hardy, who was not wearing a seat belt, was pinned under the car’s steering column and had to be extricated by Houlton firefighters, Quint said.

Hardy initially was taken to Houlton Regional Hospital, but later was transferred to Eastern Maine Medical Center in Bangor, where a nursing supervisor said he was in critical condition late Monday.

At the time of the crash, Hardy did not hold a valid driver’s license, Quint said.

The accident remains under investigation. The trooper said additional details might be released later this week and charges were possible.