Great Northern Highway has been partially closed after a road train rollover earlier this morning.
Police received reports of the incident around 8.20am and attended the scene about 10km from Wubin.
St John Ambulance also attended the scene to treat the driver, but there were no serious injuries.
The highway has been shut between Wubin and Dalwallinu, with the truck and trailer blocking half the road.
Traffic management is in place to direct travellers, but it is suggested that bigger trucks and vehicles with wide loads consider an alternative route because traffic will be flowing in one direction at a time.
A crane is needed to clear the road, and it is unknown how long this will take.