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Emergency services were called to the crash at the intersection of Barrington St and SH76 Brougham St in Addington about 7am on Thursday.
St John sent one ambulance, one manager and a rapid response vehicle responded to the scene.
They treated three patients - two in minor conditions and one in a serious condition, a spokesperson said.
The patient in a serious condition was transported to Christchurch Hospital.
The crash blocked northbound traffic on Brougham St, as well as westbound access to the motorway.
But the road was reopened this morning and all lanes have now been restored.
A Fire and Emergency NZ spokesperson said two appliances were sent to the scene.
-By Devon Bolger