An early-morning motorway crash near Victoria Park Tunnel has been cleared but traffic remains clogged back to Greenlane.

The two-car crash caused major traffic woes early this morning and motorists heading north across Auckland Harbour Bridge were warned to avoid Spaghetti Junction.

Now a backlog stretches about 7km to Greenlane and commuters are being told to factor in the extra time it will take in the slow-moving queues.

The New Zealand Transport Agency said there would be delays as the crash, in the left lane, was cleared.

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Drivers getting on the motorway at the Wellington St onramp could expect delays and it was best to avoid using the route if possible.