Passing lanes on State Highway 2 at Maramarua have today been shut down, with road cones blocking access to motorists, to try prevent crashes.
Longer queues should be expected but NZTA says there should be minimal impact to motorists overall.
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SH2 is the main highway connection between Auckland, the Coromandel and Tauranga.
Meanwhile, on the harbour bridge, NZTA's Auckland system manager Andrea Williamson said the two lanes will close in the early hours of Boxing Day.
The maintenance work would be dependent on the weather.
"The resurfacing process on the bridge requires three to five days to 'cure' before allowing traffic on it, so while it may look as [if] nothing is happening the team will be using the closure for other maintenance tasks," she said.
The harbour bridge was one of the busiest sections of motorway in Auckland with more than 170,000 vehicle movements a day.
The lanes were last resurfaced in 2017.
"We're expecting traffic to flow well in both directions and, weather permitting, the bridge will be fully opened before most people return from their Christmas break," she said.