A serious crash has the Buller Highway down to one lane.
Two people have been flown to Nelson Hospital, one with serious and the other with moderate injuries.
A third person who was initially flown to Buller Hospital with serious injuries, is being picked up by a helicopter from Christchurch and flown to hospital there.
The two-vehicle crash happened around 6.30pm and has closed a lane on State Highway 69, about six kilometres north of the Inangahua Junction in the Upper Buller Gorge.
Stop/Go traffic management is in place and the transport agency is warning there could be delays.
