A cream spill closed the Takaka Hill road after an accident this morning.
Police said a truck and trailer unit carrying cream north to Takaka crashed about 1 kilometre up the hill on the Motueka side.
They said 19,000 litres of cream leaked from the truck and left a dangerous, slippery fat residue on the road.
Police said grit has been spread over the affected area, and the road has now re-opened.
The Tasman District Council said there was no river within 1 kilometre of the crash so there is no immediate environmental danger.