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The Desert Road in the central North Island has been blocked by trees which were blown over in high winds.
Trees also fell on trucks which were sheltering in the Three Sisters rest area, photographs show.
Waka Kotahi NZTA said this morning that SH1 was now closed between Waiouru and Rangipo because of the treefall.
A detour around the blocked road would take motorists around 40 minutes, Waka Kotahi said.
MetService issued an orange wind warning for Waitomo, Taumarunui, Taupo and Taihape this morning between 7am and 9am.
The forecaster said southeasterly winds caused by Cyclone Gabrielle could reach 120km-130km/h in exposed places, damaging powerlines, trees and unsecured structures.
The cyclone was now situated north of the Bay of Plenty, and had led to widespread damage, flooding, and power outages across the North Island.