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Rockfalls in the Cromwell Gorge has meant areas of the gorge will be under stop/go control today.
The New Zealand Transport Agency said stop/go signs would be operating between 8am and 5pm on the gorge, between Alexandra and Cromwell, today and possibly tomorrow.
Road users were asked to prepare for delays of up to ten minutes and to take care travelling through the gorge.
Elsewhere, heavy snow has closed some highways and alpine roads.
The Lewis Pass (State Highway 7) near Hanmer Springs and SH94 between Hollyford Road and Milford are both closed due to snow.
NZTA said chains are required on the Lindis Pass, which has been closed to all towing vehicles due to ice, and between Te Anau and Hollyford Road.
The Queenstown Lakes District Council has said the Crown Range Rd was also closed due to snow, however it reopened at noon for vehicles with chains.
An alternate route through the Kawarau Gorge remained open but drivers were told to be cautious and to expect black ice.
Black ice could also be expected on Malagans Rd, Glenorchy Rd, Fernhill Rd, around Arthur's Point and Kelvin Heights.