A car trying to avoid a ladder on the highway runs into a semi carrying wine glasses, knocking the larger truck off the road.
The accident happened just before 7 a.m. along Highway 99 in the Manteca area.
CHP says the backup being caused by the accident, which is blocking northbound lanes, is causing more traffic problems, including a few smaller crashes.
There are only minor injuries reported from the initial crash.
Although the truck was carrying glasses, it appears there is no broken glass on the roadway and is contained within the semi trailer.