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.


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