NRC staff inspected sections of the road affected by the spill and observed some residual sulphur on the road after being notified of the spill on Friday.
The sulphur was non-toxic and motorists have been advised they should wash it off if the bright yellow substance came into contact with their vehicles.
Ballance has been transporting liquid sulphur from the refinery for 32 years and it was the first time a spill happened.
NZ Transport Agency workers swept the road and employed Hydrotech to waterblast and watercut the solid sulphur from the road surface particularly at the
intersections where the truck had stopped, allowing a build-up of the sulphur to occur.