Southbound Highway 101 traffic was fouled late Tuesday morning following an 11 a.m. crash where a white SUV towing a camper became stuck on a concrete highway barrier.
With the truck lodged on the concrete barrier, the camper behind it was blocking both lanes of traffic.
Details on the accident were scarce as of 12:30 p.m., but no injuries were reported.
The CHP was expecting that it would take another half an hour to clear the area, and was reporting that traffic was backed up to the East Washington Street exit in Petaluma.
"We're working on it as fast as we can," said CHP spokesman Andrew Barclay. "When you get big vehicles like this, it's not the easiest thing to clear."
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