One person was injured in a crash on Highway 178 Friday morning.

According to the California Highway Patrol, a sedan and a semi-truck collided just before 7:30 a.m. on Highway 178 near Dougherty Creek.

The car was going eastbound and hit the side of the mountain, CHP said. 

That collision led to the semi's rear trailer, which was loaded with dirt, rolling over. 

The driver of the car suffered major injuries, CHP said. The truck driver's condition is unclear. The truck did not seem to be damaged other than the trailer on its side, according to CHP.

The cause of the crash is under investigation. CHP said alcohol or drugs did not appear to play a role in the crash. 

All lanes of Highway 178 will be closed for about an until while the truck and car get towed.