A slip has closed the main highway on the South Island's West Coast, north of the Fox River bridge, near White Horse creek.
Photo: Supplied / NZTA
The Transport Agency said the slip came down before midnight and State Highway 6 is shut but the inland routes via Reefton and Inangahua on SH7 and SH69 remain open.
Contractors will be onsite this morning and drivers are being asked to avoid the area as there are no detours available.
NZTA said contractors were working to clear the slip in order to get one lane open.
Buller District Mayor Jamie Cleine said there was a lot of rain yesterday and overnight.
"It just creates that little bit of uncertainty I guess for people, but knowing that area I'm reasonably confident that the contractors would get that cleared up."
He said such slips were not uncommon in the area.