Police have opened the road again after a serious crash between a truck and trailer and 4WD on State Highway 1 south of Whangarei.

The crash happened at 3.30am at Puwera near Maungakaramea Rd and closed the road.

Police said the driver of the 4WD was seriously injured and the driver of the truck suffered minor injuries.

No one else was involved.

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Traffic was being diverted around the crash site at Maungakaramea Rd and Mangapai Rd while emergency services were at the scene. The road was opened again about 8am.