A truck crash blocked State Highway 1 just north of the Canterbury town of Cheviot for much of this morning.
Police said the truck crashed into a bank about 8.15am.
One person was seriously injured in the crash and a rescue helicopter called, police said.
The road, also known as Parnassus Rd, was blocked and diversions were in place, police said.
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The road has since been reopened.
Motorists were advised the avoid the area if possible or expect delays.