Police are investigating a serious assault and traffic crash that occurred this morning in Smithfield.
Preliminary investigations indicate that at around 9:50am two cars were travelling along Kuranda Range Road and have made contact with each other.
Both drivers have pulled over to the side of the road, where a physical altercation allegedly has occurred.
During the altercation one of the drivers has fallen and hit his head on the roadway, causing serious head injuries.
A 57-year-old man from Speewah was transported to Cairns Hospital and later airlifted to Townsville Hospital in a critical condition.
The second driver a 43-year-old man from Kuranda is assisting police with the investigation.
Police are appealing for anyone with dashcam vision or information to come forward.
Investigations are continuing.
If you have information for police, contact Policelink on 131 444 or provide information using the online form 24hrs per day.
You can report information about crime anonymously to Crime Stoppers, a registered charity and community volunteer organisation, by calling 1800 333 000 or via crimestoppersqld.com.au 24hrs per day.