Motorists have been warned to expect delays following a six-car nose-to-tail crash on the Southern Motorway.

The NZ Transport Agency tweeted just before noon that a crash had occurred in the southbound lanes of State Highway 1 between Hill Rd and Takanini.

The right lane was blocked as a result.

"#ExpectDelays if you are travelling in this direction."

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A police spokeswoman said just after 1pm that four cars were able to move on, but one required a tow.

"The road is now clear but the traffic backlog is still clearing."

There were no reports of injuries.

The stretch of highway is part of the $268 million Southern Corridor Improvements Project between Manukau and Papakura.

Additional lanes are being constructed in both directions and the Takanini interchange is being upgraded as part of the project.