A truck broken down on Auckland's Southern Motorway caused early rush-hour delays this morning, and another crash near the airport caused further backlog.

Police said the brakes of a truck locked up and it stalled in the middle northbound lane of the Southern Motorway between Redoubt Rd and the East Tamaki turnoff. Both crashes have been cleared - along with a third on the Southern Motorway near Drury - but delays are still expected as traffic flows return to normal.

A crash blocking one of the southbound lanes of George Bolt Memorial Drive has also now been cleared but delays are continuing.