The operator of a motorcycle sustained serious injuries after a car struck him from behind while he was attempting a left turn at Rockingham Cycles on Route 28 on Sept. 4, authorities said.

According to Police Chief Gerald Lewis, Douglas Magliozzi, 56, of Atkinson was propelled from his motorcycle and onto the pavement around 1:42 p.m., suffering wounds to his head and leg. While drugs or alcohol do not appear to be a factor in the crash, Lewis said the operator of the Chevrolet Malibu, Michael Schneiderat, 40, of Massachusetts did not make any effort to stop or brake before plowing into the rear of the motorcycle and driving over it.

Authorities said the motorcyclist was transported to Parkland Medical Center and flown by helicopter to a Boston hospital.

He was wearing a helmet at the time of the accident, according to police.

Schneiderat, the sole occupant of his vehicle, was uninjured in the collision. Though the accident remains under investigation, Lewis said charges will likely be forthcoming.

Route 28 was temporarily closed between Bissell Camp Road and Flat Rock Road while authorities investigated the scene.

Windham police received assistance from the Windham Fire Department and the New Hampshire State Police.