A crash on State Highway 16 near Kaukapakapa between three vehicles, including a large truck, has closed the road this morning.
The New Zealand Transport Agency is warning motorists to avoid the area or delay their journey after the crash, on the Twin Coast Discovery Highway just south of Makarau Rd.
The police said a person had been taken to hospital in a serious condition following the accident.
The agency said both lanes of the road were blocked after the incident. Police say the crash happened 6.15am.
The highway was closed between Makarau Rd and Kahikatea Flat Rd.
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Police advised motorists to avoid the area and take an alternative route, particularly those travelling in large vehicles.
Southbound traffic was being diverted around the crash scene at State Highway 16 and Makarau Rd, while northbound traffic was being redirected at Kanohi Rd.
NZTA was recommending motorists travelling between Kaukapakapa and Wellsford to use State Highway 1.