The crash that blocked the right southbound lane after the Mungavin interchange on State Highway 1 near Porirua has now been cleared.
All lanes are now clear, but NZTA advises that southbound delays continue, back to the Paremata roundabout.
Traffic will also be subject to multiple stoppages all this week on Remutaka Hill State Highway 2 as work takes place on rock faces.
Work will be taking place until Friday, from 8:00am to 4:00pm.
Roadworks are dependent on weather and other factors.