A truck has run off the motorway at Papakura, north off the Karaka on-ramp.

NZTA Auckland and Northland tweeted there had been a crash on the Southern Motorway north-bound after the Papakura off-ramp.

The left lane was blocked and traffic was warned to expect delays.

A Fire Service spokesman said it was a "truck versus tree" situation.

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A truck had crashed into the motorway barrier and into a tree.

No one was trapped.

A Twitter update from NZTA said: "The earlier crash on the Sthn Mwy N-bnd after the Papakura off-ramp has created traffic delays back to the Drury off-ramp."

An NZTA spokeswoman said traffic was moving very slowly.

"We encourage people to allow extra time or avoid the area if possible."