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DaWen Li, 66, of Christchurch, was killed in the crash at the intersection of Plaskett and Oxford Rds about 3.55pm.
A police spokesperson said enquiries into the circumstances of the crash are ongoing.
A spokeswoman for St John said at the time two ambulances, a rapid response vehicle and two managers attended after getting the call.
Two others were also hospitalised with moderate injuries after the crash.
One of the vehicles had been towing a horse float, said a Fire and Emergency NZ spokesman.
He said three crews from the nearby Rangiora station attended the scene.
The 100km/h stretch of road has experienced several bad crashes in recent years.