Northbound lanes of Highway 99 near Galt have reopened to traffic following a more than three-hour closure after a big rig hauling rocks struck a highway message sign and overturned.
The crash, involving a truck towing a trailer loaded with large rocks, occurred about 1:15 p.m., north of the Walnut Avenue exit.
The truck struck a highway message board, toppling the sign, then jackknifed, spilling its load of rocks onto the roadway, according to the California Highway Patrol.
No injuries were reported.
Northbound lanes of the highway were closed at Twin Cities Road, and traffic was diverted onto a frontage road.
Caltrans reported about 4:40 p.m. that the highway had reopened.