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DaWen Li, 66, was killed in the crash at the intersection of Plaskett and Oxford Rds about 3.55pm.
A police spokesperson said enquiries were 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, a Fire and Emergency NZ spokesman said.
He said three crews from the nearby Rangiora station attended.
The 100kmh stretch of road has experienced several bad crashes in recent years.