There is significant disruption to traffic on the northbound lane of State Highway One near Pokeno after a truck lost its trailer.
The trailer rolled onto its side and came to rest in the northbound lane.
Police units are currently at the scene and say traffic is likely to be affected until midday.
The slow lane north bound is open to traffic and police advise caution through that area whilst the crash site is cleared.
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The cause of the crash is not currently known, but will be investigated.