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The Queenstown Lakes District Council said there had been a long period of very cold temperatures and Wednesday's snow meant slippery conditions were possible.
Ice and loose grit were affecting roads across the network today, in particular Fernhill, Queenstown Hill, Glenorchy Rd and Arrowtown. Extra care was required around Malaghans Rd, Arthurs Point R and surrounding areas as they were icy.
There have been a few rockfalls through the Devil's Staircase on State Highway 6 (Queenstown to Kingston) overnight, so if travelling between Kingston and Frankton today, watch out for any rogue rocks on the road.
The New Zealand Transport Agency said this morning that traffic would be stopped in both directions for 10 minutes throughout the day for helicopter inspections and rock scaling.
State Highway 6 (Queenstown to Cromwell), State Highway 8 (Alexandra to Queenstown) and the Lindis Pass (SH8 Tarras to Omarama) were icy and care was needed, the New Zealand Transport Agency advised.
The Milford Road (SH94) was open, but icy, and people should drive with care, the Milford Road Alliance said.
In Wanaka, it was a little warmer, but there was still some frozen patches around Cardrona Valley, Wanaka and Hawea. Road users should watch for ice and loose grit.
Thick fog was also limiting vision in many places, the council said, and this was likely to cause more problems around day-break as the temperatures drop and more ice formed.
In Central Otago, there was a combination of wet and dry roads, with fog in places. The Central Otago District Council advised caution was needed particularly on damp areas, bridge decks, hill sections and shaded areas as these may be slippery.
Carparks and footpaths were also very slippery this morning.