It is confident of having all of the highway open to traffic by the end of July in some capacity.

"Crews remain focused on carrying out temporary works to allow the remaining closed section of the highway to be progressively reopened to single lane, with alternating traffic flow," a spokesperson said.

"It's anticipated all affected sections of the Oxley Highway will be open to a single lane by the end of July 2021."

The road has been shut since March following flooding which caused dozens of landslips, but they have now all been cleared.

Coming from the east, the highway is open as far as Mt Seaview Road, while from the west it is possible to make it as far as the Stockyard Creek rest area.

Crews are currently assessing any further damage which may have been caused by the severe weather event and determining what safeguards need to be put in place before reopening the last stretch to traffic.

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According to Transport for NSW, the size and scale of the issues caused by March's floods has required significant attention, which is why the road has been closed for so long.

"More than one metre of rain fell in the Mount Seaview area on the Oxley Highway during the recent severe weather event, causing more than 70 landslips - 10 of which were major," a spokesperson said.

"The main areas of damage are in the mountainous stretch between Long View and Ralfes Creek.

"At least five of the slips have caused major damage below the highway, and these will be the most challenging to repair."

Meanwhile, Waterfall Way, which has been the primary route for many New Englanders to get to the coast ever since the Oxley Highway shut, is about to receive a $6.5 million upgrade.

The works are being jointly funded by the NSW and Commonwealth governments, and will occur just east of Armidale on a heavily used part of the road.

"This project will upgrade a 5.7 kilometre section of road near Wollomombi, improving safety for around 1,700 vehicles which use this part of Waterfall Way each day, including about 170 heavy vehicles," said Northern Tablelands MP Adam Marshall.

"Work will also be undertaken to widen and resurface the road, improve drainage, install safety barriers and replace a cattle grid."

As part of the roadworks, one lane will be closed with alternating traffic flow arrangements put in place, while the speed limit will be reduced.

Drivers should allow five minutes extra travel time, but are also being asked to take into account works occurring further along Waterfall Way between Dorrigo and Bellingen.

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