SAN FRANCISCO, Oct. 3 (Xinhua) -- Four people were killed Thursday after a car heading against traffic collided with a taxi on a highway in Northern California, the California Highway Patrol (CHP) said.

Local news reports quoted CHP officers as saying that the driver of the car was identified as 34-year-old Emilie Ross from Hillsborough, a town in San Mateo County south of San Francisco.

Initial investigation showed that Ross was drunk when she was driving the car southbound on a northbound lane of Highway 101, and crashed head-on into the taxi operated by 42-year-old Berkant Ahmed. The crash killed both drivers and two passengers riding on the taxi.

The CHP said the tragedy was the 25th accident related to a wrong-way driver in the Bay Area. Nineteen people were killed in 10 fatal accidents, with only one death not involving driving under the influence.