CHP officers responded to reports of a crash on Highway 1 near Montara State Beach at about 6:45 a.m., CHP Officer Kevin Bartlett said.
Two vehicles appeared to have been involved in the collision, which caused one of them to leave the roadway on the southbound side and plunge more than 100 feet, Bartlett said.
The driver of the vehicle was killed, Batlett said.
His identity has not been released.
The crash is still under investigation.