A truck driver has moderate injuries and State Highway 2 is down to one lane after a truck rolled off the road near Wairoa.
Police were notified of the crash just before 1pm south of Wairoa in the Waihua area.
A Fire and Emergency spokeswoman said that the driver, initially trapped, only needed minimal assistance before they were freed.
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She said the truck's cargo had caused some of the road to be blocked.