Police believe the car was following a B-Double truck on dual lanes as they began to merge into a single lane.
At this stage, it is understood the female driver thought the truck was moving over when she braked heavily and lost control of her vehicle.
Police confirmed the orange Holden Commodore left the roadway and hit a tree.
The male passenger passed away at the scene.
The female driver was taken to hospital with non-life-threatening injuries.
Police have said investigations into the cause of the accident are ongoing.
Anyone with information or dash cam footage of the vehicle prior to the accident is urged to contact Crimestoppers on 1800 333 000.