Burnoffs choked several kilometres of State Highway 2 in thick smoke, potentially causing one nose-to-tail crash and forcing police to close the road.
Emergency services responded on Saturday morning to a two-vehicle crash in Ōtāne, Hawke's Bay, about 9.30am that police initially reported was caused by smoke from a burn-off.
There were no injuries in the crash.
The road was closed with diversions for long weekend motorists. At 11.07am, motorists were allowed back on the road but a temporary speed restriction was in place.
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"It is believed smoke in the area from a suspected burn-off is causing significant visibility issues along SH2 and led to the crash," police said in a statement.
Footage on social media suggested the road was choked in smoke for several kilometres at its peak.