A new slip has closed a section of State Highway 1 north of Auckland in both directions.
A previous slip closed the same busy section of the Dome Valley highway between Warkworth and Wellsford yesterday.
The latest slip will see the section of road remain closed overnight.
"The slip which is still moving, has spilled 30 truckloads of material onto the road," Waka Kotahi said.
"This afternoon, crews will be removing material from the top of the slip with water via a helicopter. This technique is called sluicing and washes the material off the top to break it up and prevent further slips."
A detour is available via State Highway 16, West Coast Road and Woodcocks Road.
Video provided to 1News by Waka Kotahi shows a portion of the hill begin to slide down onto the road, taking trees with it.
Waka Kotahi said an update will be provided in the morning.
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