ORINDA -- A 25-year-old Berkeley woman was arrested on suspicion of driving under the influence after she drove the wrong way through the Caldecott Tunnel in Oakland Wednesday morning, colliding head-on with another vehicle, according to the California Highway Patrol.

The woman, who was driving a 2007 Honda, somehow entered eastbound state Highway 24 going in the wrong direction, according to the CHP. She continued westbound through the middle bore of the Caldecott Tunnel, which at the time was open only to eastbound traffic.

A few minutes before 4 a.m., a 28-year-old Redwood City woman was driving her 2003 Jeep eastbound through the middle bore of the tunnel when she came around a bend in the road and encountered the other vehicle headed at her in the same lane.

Both drivers saw each other, braked, and swerved, but could not avoid a head-on collision.

Both women were wearing their seatbelts, and the air bags in both vehicles deployed. The driver of the vehicle headed in the wrong direction broke her clavicle. The driver of the second car sustained only minor injuries, the CHP reported.

The middle bore of the tunnel was closed for approximately an hour and 15 minutes this morning.

There was evidence that the Berkeley woman was intoxicated, according to the CHP, and she was arrested at the hospital.