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A woman was critically injured and three other people were hurt in a three-car crash near Whatawhata in Waikato overnight.
The crash happened on State Highway 23 just before 10pm.
It was believed two cars travelling towards Raglan and a car heading towards Hamilton collided.
Waikato road policing manager Inspector Marcus Lynam said the weather was good at the time.
One woman driver suffered serious injuries and was taken to Waikato Hospital where she was in a critical condition.
Another woman driver suffered serious leg injuries, and two other people suffered minor to moderate injuries.