Police are waiting to speak to both drivers involved in a multi vehicle collision on the North Logan Road around 1.30pm on Tuesday.
The collision involved a 23-year-old male, originally from Woonona, driving a Toyota HiLux and a 78-year-old Canowindra man driving a Toyota Corolla.
Preliminary police inquiries suggest the young male driver has drifted onto the incorrect side of the road and came into contact with the Corolla. The HiLux then continued on for a distance before overturning several times, ejecting the driver.
The 23-year-old male was air lifted to Canberra hospital where he remains in a critical but stable condition. The 78-year-old male was conveyed to Cowra hospital suffering from minor cuts.
Both vehicles have been seized for a mechanical examination.