UPDATE: The A390 has reopened between Chiverton and Threemilestone. Cormac say there are lots of warning signs, as the road may be still a bit slippy or in places, sandy.
The A390 is set to re open soon after a being closed for hours due to a large diesel spill.
The road was closed from Penstraze, Chiverton to Threemilestone, Truro after the spill just after 6am.
A total of ten firefighters from Redruth and Camborne are in attendance, with fire crews working alongside Cornwall Highways and police to stem the 700 litre diesel leak from a tractor.
Crews used a spill kit and shovels to stem and contain the leak.