A truck crash has blocked part of Auckland's Southern Motorway this morning.

Both lanes of the northbound side of the Takanini off-ramp are closed, according to NZTA.

Traffic is being diverted off the northbound lanes at Papakura.

Firefighters have been to mop up a diesel leak but it is expected to take a few hours to clear.

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St John Ambulance attended but no one was taken to hospital.