UPDATE (12.46pm): The road is now open.

A truck has jack-knifed on State Highway 6 (Kawarau Gorge Road), Kararau Gorge at around 7:55am this mrning (25 Dec).

Police said there were no reports of injury but the vehicle was blocking the road and partly overhanging the side of the road.

It may take some time to clear and motorists are advised to avoid the area, they said.