State Highway 1 north of Auckland is closed and three people have been seriously injured, following a crash between a truck and a car.
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Emergency services were called to the crash, south of Warkworth at 1.55pm.
St John said three patients had been transported to Auckland Hospital in a serious condition.
The highway is closed between Woodcocks Road and Valerie Close.
The Transport Agency is advising people travelling between Silverdale and Wellsford to use State Highway 16.