Northbound traffic is now flowing smoothly on part of State Highway 1 north of Auckland, with queues between Puhoi and Wellsford having died down.
But the stretch of road between Warkworth and Wellsford, through Dome Valley, is still congested, according to New Zealand Transport Agency.
Earlier today, motorists were warned to avoid the area, delay travel, or use State Highway 16 as an alternative route.
There is also congestion at the intersection of SH2 and SH26 in Paeroa and drivers are advised to avoid the area or delay their journey.