NICASIO, Calif. (KGO) -- The California Highway Patrol is investigating what caused a head on collision between a Marin County Sheriff patrol car and a passenger vehicle.
It happened at about 10 Saturday morning on the Petaluma-Point Reyes road near Nicasio Reservoir.
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The driver of the grey car went to the hospital with non-life threatening injuries.
The deputy was checked out as a precaution and cleared to return to work.
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Both vehicles were badly damaged and traffic slowed to one lane while the accident was cleared.
A crashed Marin County Sheriff patrol vehicle is seen near Nicasio, Calif. on Saturday, July 1, 2017. (KGO-TV)