Four people are injured after a truck and three cars crashed on Auckland's Northwestern Motorway around 4.45pm.
A St John spokesperson said one person was in a serious condition and three others sustained minor injuries.
The person with serious injuries had since improved to moderate condition.
The crash blocked two right-hand city-bound lanes, causing delays, but all lanes had since reopened.
![An Auckland motorway lane is blocked following a multi-car crash. Photo / NZTA](https://www.nzherald.co.nz/resizer/v2/OQKB4XJEK4HVDPLDAB5X6CUMY4.png?auth=e0459de195bf9a4dfaff28362549578a20a548bfa56f7d67113cc40ec3808f24&width=16&height=11&quality=70&smart=true)