Motorists are being advised to take extra care on some icy southern roads this morning.
Waka Kotahi NZ Transport Agency is warning of icy conditions on State Highway 1 Dunedin to Gore; SH8 Raes Junction to Glenore; and SH90 McNab to Raes Junction.
Earlier, the Central Otago District Council advised of sub-zero temperatures, especially in the Maniatoto and Manuherikia areas. The council said crews had gritted all trouble spots as a precaution.
The Queenstown Lakes District Council said black ice was widespread throughout the district, and advised drivers to use "extreme care".