Woman found unconscious in her car after crash near Sonoma

A man died Thursday night after stepping into the path of a car on Interstate 80 in Vallejo, triggering a chain reaction crash. A man died Thursday night after stepping into the path of a car on Interstate 80 in Vallejo, triggering a chain reaction crash. Photo: California Highway Patrol / Photo: California Highway Patrol / Image 1 of / 43 Caption Close Woman found unconscious in her car after crash near Sonoma 1 / 43 Back to Gallery

A woman was found unconscious in her car Tuesday morning after an early morning collision near Sonoma, authorities said.

The incident was reported at about 7 a.m. on State Route 12 near Leveroni Road, according to the California Highway Patrol. A gray Toyota and red Nissan collided for unknown reasons, CHP said.

When officers arrived on scene, they said a woman was unconscious in the red Nissan and unable to roll down her window, CHP said.

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No other information was available on what caused the crash and the extent of the woman’s injuries.

No other injuries were reported and there were no traffic delays.

Sarah Ravani is a San Francisco Chronicle staff writer. Email: sravani@sfchronicle.com Twitter: @SarRavani