A truck that rolled onto its side after hitting a bridge has blocked State Highway 29 near Matamata in both directions.
Police said the road may be closed for a few hours while the vehicle is removed.
The crash occurred about 9.45am.
A police spokesman said the cab of the truck was on one side of the road while the trailer was on the other.
Contractors were on their way to the scene.
No one was injured in the incident.