Part of the Coastal Highway west of Nelson remains closed after a fatal crash between a this morning.
One person died and St John treated two other people at the scene of the accident following the crash between a car and a truck just before 9.30am.
Firefighters were also called to the scene to extinguish a fire that started as a result of the crash.
Police want to hear from anyone who may have seen a blue Rav4 being driven erratically near Motueka, prior to the crash.
The Coastal Highway between Gardner Valley Road and Aporo Road remains closed, with diversions in place between those two intersections.
It is expected to be closed for some time and the detours are suitable for heavy vehicles.