A man is in critical condition, another two are seriously injured, and another two have been injured after four separate crashes around the country overnight.
A motorcyclist was flown to hospital after a serious crash on State Highway 2 near Kaitoke, Upper Hutt around 4.30pm.
A Fire and Emergency New Zealand spokesman told the Herald the motorcyclist had been helicoptered to hospital in a critical condition after the incident.
A police spokesperson said the motorcyclist hit a barrier which forced the temporary closure of the road.
In Waikato, a person was seriously injured in a crash in Karapiro, shortly before 9pm.