Police and other services have been clearing vehicles damaged in a five-car nose to tail collision on the Hutt Motorway north of the Ngauranga Gorge interchange tonight.
Both lanes were reopened by about 8pm.
However there was a large backlog of northbound vehicles and police said it would take some time before traffic fully cleared.
The crash was reported at 6.45.
An hour later, north-bound traffic on the motorway was backed up to Aotea Quay.