State Highway 3 just south of Waitotara was down to one lane late Friday morning after a truck and trailer tipped over, smashing through a farm fence and blocking one lane.
The northbound truck appeared to have left the road on the left hand side before crossing back over the centre line and crashing through a paddock fence at about 11am.
The truck's rear trailer was tipped up on its side.
No other vehicles were involved and the driver was uninjured.
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"It looks like it may have been wind," a police spokesperson said. "There were no other vehicle around at the time."