The crash left traffic backed up on the motorway for most of the afternoon, after a car collided with the barrier between the Westland St on-ramp and the Old Brighton Rd off-ramp, a police spokesperson said.
The road was re-opened about 5.30pm, an NZTA spokesman said.
The crash was reported about 2.50pm and motorists were advised to expect delays while emergency services were at the scene.
A Hato Hone St John spokesperson said two ambulances and one rapid response unit responded.
Ambulance staff treated one person at the scene, before transporting them to Christchurch Hospital by helicopter.
A reporter at the scene said it appeared a vehicle towing a trailer had "jack-knifed" and hit the barrier of the motorway, damaging the barrier.
Emergency services towed the vehicle.
- Allied Media
