Traffic is expected be flowing in a single lane around a slip blocking State Highway 6 between the Gates of Haast Bridge and Haast Pass Summit by Friday.
A large slip at Diana Falls has kept the highway closed since last Wednesday.
Transport Agency West Coast area manager Mark Pinner said a geotechnical team inspected the site this morning and was satisfied it was stable enough to again allow clearing work to resume.
"The original slip was about 40 metres wide, but additional debris that has been washed down since then has increased the slip width to almost 80 metres, and it is much higher also.
"Debris is now piled higher on the road, bringing an added complication to clearing work".
Mr Pinner said the forecast for the next few days was looking reasonably settled, but more bad weather was expected for the area on Thursday.
He said the agency understand the importance of getting this road open again and the frustration of those who rely on it, with the setbacks in getting it open again.
Provided there were not any further setbacks it was hoped to have one lane of the road open by Friday.
