A 59-year-old Park City man died from injuries sustained in a crash on Monday near Roberts.
The incident happened at about 2:15 p.m. near milepost 85 off Highway 212, said Montana Highway Patrol Trooper Todd Hagenbuch.
The man was to the side of the northbound side of the road in a 1971 Dodge Dart, straddling the fog line. He appeared to be making a U-turn, Hagenbuch said.
As he turned southbound, a Wyoming couple in a 2008 Ford F-450 hauling a 42-foot fifth-wheel trailer plowed into his driver's side door, Hagenbuch said.
The Dart was pushed several hundred feet north of the where the impact occurred, crossed the center line and ended up off the west side of the road. He was trapped in the vehicle.
First responders were able to get the man out of the car and said he was unconscious but still alive at the scene. He was taken to St. Vincent Healthcare in Billings, where he died from his injuries.
The crash is still under investigation.