A State Police trooper was hit about 10:30 p.m. Tuesday while directing traffic around construction on the Merritt Parkway in Fairfield, past Burr Street in the northbound lanes.

The trooper, Sgt. Benedict Liberatore, 54, was stopping traffic to allow O&G Construction employees to work on the highway when his cruiser was struck from behind and pushed into the highway's Jersey barrier, according to State Police Sgt. John Jacobi.

To extricate the trooper from his cruiser, the roof had to be removed. The trooper was unconscious for a brief time at the scene and taken to St. Vincent's Medical Center in Bridgeport with non-life threatening injuries, Jacobi said.

Liberatore, who has been a trooper for 19 years, complained of leg and back injuries, police said.

The driver of the vehicle that hit the trooper's car, Geno Restaini, 68, of Wilton, also was taken to St. Vincent's with minor injuries.

The accident is under investigation.