Police are urging motorists in the country's south to stay off the roads on Sunday night due to "significant" black ice in Central Otago, Southland and Waitaki.
There were several crashes during the afternoon where cars slid off the road and rolled.
None of the crashes resulted in serious injury, police said.
"If travel is absolutely necessary tonight, please be extremely mindful of the treacherous conditions," a statement said. "Take your time, be patient with other drivers and keep to an appropriate speed for the conditions."
They urged drivers not to overtake vehicles travelling slowly: "It's better to be delayed by 10 minutes than to not get to your destination at all."