Drivers around the capital are being warned of a crash causing delays on State Highway 1 near Paekākāriki.
Waka Kotahi NZTA advised there were southbound delays back to Mackays Crossing and northbound delays back to Pukerua Bay.
Police said a car collided with a median barrier just after 7am, and that nobody was injured.
The transport agency asked motorists to pass with extra care and be prepared to slow down on request.