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State Highway 2 north of Wellington has been closed after a slip near the summit of Remutaka Hill.
Emergency services and contractors are at the scene and heavy machinery is en route.
Drivers are cautioned to take an alternate route if possible or delay travel.
An alternative route between Wairarapa and Wellington is via Woodville and Ashurst by Saddle Road - this is a significantly longer journey, and road users should plan their travel accordingly.
Updates on the highway's status can be found on the Waka Kotahi website.