An overheight vehicle hit the Waterview tunnel on State Highway 20, causing severe traffic delays. Two northbound lanes were closed as crews inspected the damage. Only one lane remained open, leading to long queues. Earlier, three of four northbound lanes were closed due to a serious crash, but they reopened around midday. Waka Kotahi NZTA warned that delays would still take time to ease and advised people to delay travel or choose an alternative route.