Seven people are injured after a crash on State Highway 1 between Foxton and Levin.
The two vehicles collided just after midday.
One person was air lifted to Palmerston North Hospital with serious injuries.
The others have sustained minor to moderate injuries.
Diversions are in place but motorists are asked to avoid the area if possible.
A road safety campaigner blames the previous, National-led government for failures to enforce the rules around warrants of fitness.
Another vehicle inspection business has been immediately suspended over substandard Warrant of Fitness assessments.
The widow of a man who died in a truck crash is thrilled the inquest into the death is being reopened.
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