ETNA, Maine — Two couples from Saint-Antoine, New Brunswick, who were en route to New Hampshire International Speedway in Loudon, escaped serious injury Thursday after the pickup truck in which they were riding wound up in the median between the northbound and southbound lanes of Interstate 95.

Anita Boucher, 46, a passenger, suffered a shoulder injury in the accident, according to state police Trooper Seth Edwards.

The driver, 46-year-old Joseph Cormier, and two other passengers, Boucher’s husband, Denis Boucher, 47, and Cormier’s wife, Rachel Cormier, 45, accompanied the injured woman to Sebasticook Valley Hospital in Pittsfield.

According to Edwards, the accident occurred around 2:30 p.m., when Cormier tried to pass a tractor-trailer and the camper he was towing began to sway.

The swaying camper ended up pulling the 2004 Ford pickup owned by Denis Boucher into the median where it rolled onto its side, the trooper said. The camper remained upright.

Damage to the truck and camper was estimated at $12,000.

Edwards said that southbound traffic on I-95 was reduced to one lane for more than two hours after the accident, resulting in significant travel delays. The flow of traffic was restored to normal about 5 p.m.

No charges are anticipated in connection with the crash, he said.