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NZTA Waka Kotahi says there is currently no estimates on when State Highway 2 will reopen.
A single vehicle crash at Tangoio, a settlement 30 kilometers north of Napier, was reported to the police just before midday.
An NZTA spokesperson says the Serious Crash Unit remains on site and motorists should take detour via Tangoio Settlement Road before rejoining the motorway.