Ferries services have returned to normal on the Devonport - Auckland route after a breakdown cancelled several sailings this morning.

Fullers confirmed return services between the North Shore suburb and downtown Auckland were running just before 8.30am.

Auckland Transport had earlier tweeted that six return sailings between 7am and 8.15am had been cancelled after a vessel broke down.

However, some road commuters still face headaches.

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The New Zealand Transport Agency tweeted at 8.20am that the left south-bound lane on Auckland's southern motorway was blocked between Greenlane and Ellerslie.

"Expect #delays in both directions nearby."

The blockage is believed to have been caused by a truck fire.