Police in the Southern District are urging drivers to stay off the roads tonight if they can possibly do so.
There is a significant amount of black ice in several parts of the district, including Central Otago, Southland and Waitaki.
Police received reports of several crashes this afternoon where cars have slid off the road and rolled.
There were also numerous crashes around the district on Saturday as cars skidded on slick roads.
Fortunately none of today's crashes had resulted in serious injury, police said.