A truck and trailer unit has rolled blocking State Highway 12 in Northland.

The unit rolled near Bellamy Rd, Ruawai, about 2.50pm and has blocked the road.

The driver escaped without serious injury and police were at the scene working on a plan to clear the road.

Police are urging motorists to be patient and to avoid travelling SH12 if possible

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A crane will be needed to right the truck and trailer and it is expected the road will be closed for several hours.