Five people spent the night in their cars after becoming trapped by slips on State Highway 25 on the Thames-Coast Rd.
Waka Kotahi NZ Transport Agency said the two “large slips” came down south of Tapu near Ruamahunga and near Waiomu.
They are blocking both lanes and so the road is closed between Tapu and Waiomu.
“Up to five people were caught between the slips last night,” a Waka Kotahi spokesperson said.