One person is trapped after a "truck versus truck" accident in Auckland west of Manurewa.

Police confirmed one vehicle was a rubbish truck, but they weren't aware of injuries at this stage.

Auckland Transport said in a post to Twitter the crash had delayed traffic.

They reported southbound lanes were closed, and northbound lanes remain open on Roscommon Rd.

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A fire communications spokeswoman confirmed the trapped person had been freed.

The person had lacerations, and they were treated by ambulance at the scene.