One person is dead and two others are in a serious condition after a truck and another vehicle collided near Ruakaka, south of Whangarei.
Police say the accident at 7.30am was on State Highway One north of Flyger Road.
The state highway is completely blocked and road diversions are in place.
Traffic is being diverted from Paparoa/Oakley Road through to Paparoa and then onto State Highway 12 through to Maungaturoto returning to State Highway One just south of the Brynderwyns.
Police are investigating the crash.