A man has sadly passed away after he was critically injured in an incident which occurred on the Big River Way last week.

Around 6pm on August 6, emergency services responded to reports a Mazda Bravo had been damaged after it was struck by an object, later revealed to be a roll of wire, while travelling on the Big River Way at Swan Creek.

Officers from the Coffs/Clarence Police District also attended the scene.

Upon arrival, they found the driver of a Mazda Bravo, a 35-year-old man from Ulmarra, had incurred serious head and chest injuries.

He was treated at the scene by NSW Ambulance paramedics before being airlifted to the Gold Coast University Hospital in a critical condition.

Tragically, he passed away in hospital on August 8.

Two passengers in the Mazda Bravo, an eight-year-old girl and a three-year-old boy, did not sustain any injuries as a result of the incident.

Officers from Coffs/Clarence Police District established a crime scene which was later examined by specialist police from the Crash Investigation Unit.

Police are continuing investigations into the circumstances surrounding the collision and are seeking witnesses and/or dashcam footage from motorists who were travelling between Ballina and Ulmarra between 2-6pm on August 6.