A Sacramento man died Thursday night on Highway 49 north of Mokelumne Hill when he lost control of his big rig and two trailers on a steep, curved downhill slope.

About 8:30 p.m., Michael Clark, 42, was driving a 2012 Freightliner big rig pulling two trailers on Highway 49 transporting asphalt from Carson Hill Rock Products in Angels Camp to a Highway 88 paving project in Amador County.

The driver lost control when he reached a speed of about 40 mph while descending a grade south of the North Fork Mokelumne River Bridge near Mokelumne Hill.

The Freightliner went off the road and up an embankment on the east side of Highway 49, and both the truck and a trailer began to overturn.

The driver was ejected from the cab as it overturned. He sustained fatal injuries when he was struck by the trailer as it fell over on its left side.

Highway 49 was closed from Mokelumne Hill to Amador County while asphalt was removed from the road and the accident was investigated, the news release said.

Neither drugs nor alcohol are suspected to have played a role in the incident.

Contact Giuseppe Ricapito at (209) 588-4526 or gricapito@uniondemocrat.com . Follow him on Twitter @gsepinsonora.