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.
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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.