A chunk of busy State Highway 1 - a main route in and out of Christchurch - has been closed after a crash.
Motorists in Christchurch are asked to avoid the area around Main South Road, Rolleston following the crash just after 5.30pm.
Due to the crash there are diversions in place at Waterholes Road and only the north-bound lane on Main South Road is open to traffic.
Two cars were involved in the crash.
One person has received serious injuries in the crash and four other people have also been injured.
