Five people are in hospital after a single-car crash in Te Horo, where one of the injured was thrown from the car.
A police spokeswoman said the person thrown from the car was in a serious but stable condition.
She said she was unsure what condition the four other young people were in, but they were all taken to Palmerston North Hospital.
The car crashed in the passing lane on State Highway 1 about 8pm on Wednesday.
Since the crash happened on a passing lane, traffic was still flowing, the spokeswoman said.
She added that it was unclear what caused the crash.