Works to bring the Rangiriri section of State Highway 1 up to 110km/h are on track to be finished by Easter.
The 4.8km section of the Waikato Expressway had repair work in the months before Christmas, and a final surface will be applied soon.
A New Zealand Transport Agency Waka Kotahi spokesperson said that all going to plan, contractors would start to lay the final surface from March 6, but this meant more road closures.
Northbound lanes would be done first and take two to three days. During this time, the northbound on and off-ramps to the Rangiriri and Te Kauwhata interchanges will be closed and detours in place.
From March 17, or potentially earlier, the southbound lanes would be sealed, with on and off-ramps south closed and detours in place for two to three days.