The NZTA has warned motorists to expect "long delays" after a three-car pileup on the Southern Motorway in Auckland.
Two southbound lanes are blocked in a section of the motorway between the East Tamaki Rd onramp and the Te Irirangi Drive offramp.
St John ambulance services are on the scene. One patient had serious injuries while all others had moderate or minor injuries, a St John spokeswoman said.
Police were first called to the nose-to-tail at 6.15pm, a spokeswoman said.