A semi truck rolled over Wednesday after colliding with a guard rail and spilled diesel, prompting a lane closure on westbound Interstate 10 in Chiriaco Summit.
The crash was reported shortly before 10:30 a.m. Wednesday west of Box Canyon Road, according to the California Highway Patrol.
Paramedics arrived a short time later and reported no injuries to the driver.
The vehicle drove onto the right shoulder for unknown reasons and then hit a guard rail, resulting in the truck trailer overturning, the CHP said. Fire crews encountered the semi on its side blocking the No. 2 lane.
County Environmental Health and a hazmat team were requested to assist at the scene, according to the Riverside County Fire Department.
A Sigalert was issued shortly after 11 a.m. for an undetermined amount of time to clean up the spilled diesel.
The cause of the crash was not immediately known.