A "very large slip" has come down on to State Highway 2 at Waiotahe Beach between Ōpōtiki and Whakatāne, closing the road between Waiotahi Valley Back Rd and Paerata Ridge Rd.
The slip is about 70 to 80m long and 20 to 30m high and covers both lanes, a Waka Kotahi New Zealand Transport Agency media statement said.
There are no reports of injuries.
Geotechnical engineers are on their way to assess the slip, which is still moving.
The highway was under stop/go traffic management at the time while contractors were in the process of clearing an old slip. A van travelling through the site was pushed over by falling debris as the new slip came down.