Police were en route to intercept a car driving the wrong way on Auckland's northwestern motorway this morning before the vehicle collided with another car.
An adult and two children in the car travelling in the correct direction were taken to hospital following the crash, as was the female driver of the vehicle travelling the wrong way.
Ambulance staff treated the injured at the scene, and took the adults to Auckland City Hospital and the children to Starship.
A spokesman for Auckland District Health Board said one adult and one child were then admitted into its care with serious injuries. Late this afternoon they were in a stable condition.
The crash occurred on the city-bound lanes of the northwestern motorway between Lincoln Road and Te Atatu.