An hour later seven people were hurt - three badly - when their vehicle crashed on a notorious stretch of State Highway 3 in Manawatu.
Police said they were called to the single-vehicle crash on Rangitikei Line in Newbury at about 7.10pm.
A St John spokeswoman said three people were taken to Palmerston North Hospital with serious injuries and two with moderate injuries.
Another two patients had minor injuries and were treated at the scene.
Four ambulances and a manager vehicle attended the incident.
The road was down to one lane, police said. Motorists were advised to expect delays and avoid the area if possible.