A lane has been blocked on Auckland's Southern Motorway following a crash.

Emergency services are at the scene.

The New Zealand Transport Agency said initially multiple lanes were blocked just after the Highbrook off-ramp.

At 3:30pm an update was issued saying the left lane remains blocked and drivers are warned to expect delays.

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An NZTA camera on the Bairds Rd bridge over the motorway showed heavy traffic northbound on the motorway.

The police said the crash was reported at 3.06pm.

It involved two vehicles - a van and a car.

Two people were injured. One person's injuries were moderate and the other's were minor.

Tow trucks were arriving at the scene at about 3.45pm, a police spokeswoman said.

"Hopefully it will be unblocked and all clear soon."