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March 20 (UPI) -- Authorities in California said drivers faced major delays when a semi truck hauling two trailers overturned on a highway and covered the roadway in grain.

The California Highway Patrol's Stockton station said a semi truck hauling two trailers filled with grain overturned on State Road 99, just south of Yosemite Avenue, about 10:38 a.m. Thursday.

The CHP said traffic was reduced to a single lane during clean-up operations and warned drivers to "expect major delays."