A 23-year-old Rockland man died Monday morning when he was struck by a car while walking before dawn on the cement plant flats along Route 1.

Thomaston Police Chief Kevin Haj said Tyler Wentworth was thrown over the vehicle and died at the scene.

The accident occurred shortly before 5 a.m., Haj said. A Dodge Intrepid was driving north toward Rockland when the vehicle struck Wentworth, who was wearing dark clothing. A witness in a vehicle behind the Intrepid confirmed the other motorist’s version of what happened.

Thomaston police, the Thomaston Fire Department and Thomaston ambulance personnel responded as did Rockland emergency medical services. The Maine State Police are assisting Thomaston in the investigation. Officer Tim Hoppe is the lead investigator in the case, Haj said.

Route 1 from Buttermilk Lane to Old County Road in Thomaston remained closed for several hours Monday morning as traffic was rerouted. The road was re-opened at about 9 a.m.

Haj said it was not certain exactly where Wentworth was standing, but he was either in the road or at the edge of the travel lane.