A man is dead and a woman seriously injured after a car crash in the Hurunui District, north of Christchurch.

A car rolled off State Highway 7 around 5am on Karaka Rd, about 1km south of Mt Alexander.

The vehicle appears to have left the road at speed, gone through a fence and rolled into a paddock, police said.

The injured woman was flown to Christchurch Hospital.


Police said they wanted to thank those who stopped at the scene to offer assistance.

The Police Serious Crash Unit is investigating.