The surfacing repairs began in September and had been extended to a late-November finish after further works were identified in the investigation stages after traffic was moved.
With the changing layout, Waka Kotahi said motorists should take extra care when travelling through the interchanges by following any temporary speed limits, traffic management and signs.
When the current works were complete a 70km/h speed restriction would remain for a settling period ahead of final surfacing.
Waka Kotahi said people should allow extra time if travelling on this section of the expressway and recommended they merge early into a single lane to help lessen congestion.
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