One person has serious injuries after a crash between a truck and a motorhome in North Canterbury shortly before midday.

Emergency services were called at 11.41am after the crash on State Highway 7, the alternate main route linking Picton and Christchurch, near the intersection of Bain Rd at Waipara.

Police said one person was trapped in a vehicle with serious injuries.

The road is partially blocked.

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A Fire Service spokesman said three appliances from Waipara, Waikari and Amberley rushed to the scene and used rescue gear to help extricate one person from a vehicle.

St John confirmed it has paramedics at the scene.