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Motorists travelling on State Highway 1 between Warkworth and Wellsford last week were detoured to State Highway 16 after a major rock fall in the Dome.
The road was closed on Tuesday morning until midday and then again on Wednesday and overnight on Thursday.
While Waka Kotahi directed traffic to the detour on State Highway 16, many chose to use the Matakana/Whangaripo Hill, including a lot of heavy vehicles.
There was also congestion around the Falls Road ford when a truck and trailer became stuck.
Waka Kotahi said 30 truckloads of material had spilled onto the highway in the Dome and material from the top of the slip was removed using water from a helicopter.
This technique, called sluicing, washed the material off the top to break it up and was aimed at preventing further slips.
