A northbound lane on the Christchurch southern motorway has been blocked following a crash involving two cars.
Two people have been injured in the crash, near the Curletts Rd on-ramp,with one person sustaining serious injuries as a result of the incident.
One of the cars in question, a grey van, appeared to have one person trapped who required extrication.
St John told the Herald they responded to the two-vehicle incident around 10.40am.