A car has careened off the side of State Highway 2 on the Remutaka Hill and overturned, with one person reportedly injured.
A police spokesperson told the Herald the car went off the road at 9.42am and the driver has been flown to hospital.
Waka Kotahi NZ Transport Agency is urging motorists to be patient as congestion eases on the road.
It was initially closed, then under stop/go management but has since reopened completely.