A crash on Auckland's Southern Motorway that was blocking all of the northbound lanes, spelling trouble for early morning commuters has now been cleared.

The crash was blocking the lanes after Symonds St in the Spaghetti Junction area.

Congestion has now backed up between Greenlane and the CBD.

The New Zealand Transport Agency said to avoid the route and expect delays.

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"There was a report of a tyre on the road."