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Ice is causing problems for motorists between Wellington and the Wairarapa.
It is affecting State Highway Two, two kilometres either side of the Rimutaka Hill summit.
MetService weather forecaster Vive Biukoto says there is a lot of frost this morning because of the clear sky last night.
She says temperatures got down to below zero degrees in some central inland areas of the North Island.
She says there is likely to be frost and ice in some places again tonight in northern parts of the South Island.
- NEWSTALK ZB
