A trailer flipped on State Highway 2 near Horokiwi in Wellington this morning.
Both southbound lanes were blocked following a two-vehicle crash, but have since re-opened.
Emergency services were called to the scene at about 11.25am.
There were no reported injuries, but one of the vehicles was towing a trailer, which flipped.
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The crash has now been cleared, but traffic is still reported as being heavy in the area.
Police thanked motorists for their patience while emergency services worked to clear the scene.