A critically injured man had to be cut from his vehicle after a truck and car collided on State Highway 1 south of Whangarei.
The elderly man was treated before before being flown to Whangarei Hospital in a rescue helicopter.
Emergency services were removing crash debris from the scene about 17km south of Whangarei.
Parts of State Highway 1 could be closed until 5.30pm, according to Northland Police.
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The crash happened near the highway's intersection with Cotton Road.
"Due to the crash vicinity there are no immediate diversion routes," Northland Police said.
Police said motorists unfamiliar with the area should delay travel.