Traffic management is likely to stay in place for several weeks while the full width of the highway is reinstated.
Rocks and debris that had fallen onto SH1 from the hillside have been cleared.
Geotechnical engineers are providing advice on any potential land movement or risks that may require further action.
On Friday, a new slip came down over a restricted area of the road near Kaikōura, complicating efforts to get the main route back open.
A new slip fell on a section of State Highway 1 near Kaikōura days after severe flooding hit the region. Photo / NZ Transport Agency Waka Kotahi
When the highway is reopened, NZTA said people are asked to travel with care and to respect the traffic management requirements that will be in place.
The inland Route 70/Inland Kaikōura Road to the west of Kaikōura remains closed.
A detour route via State Highways 7, 65, 6 and 63 is still available.