A car accident on the Pacific Highway at Knockrow at around 9:15am today (Wednesday August 5) has seen the driver of one of the cars taken to Gold Coast University Hospital.
The woman was driving south on the highway, returning to her home in Yamba when the car she was driving collided with another vehicle heading northbound.
The woman is in a critical condition.
Her two passengers suffered less serious injuries but were also transported to hospital.
The male driver of the other vehicle sustained minor injuries
Police say the Ballina crash investigation unit is still examining how the accident occurred.
Traffic on the highway was blocked until about midday.