Looks like it'll be a bit slippery.

http://www.stuff.co.nz/national/3744...taka-Hill-road

The spill was believed to have started near the top of the Rimutakas on the Featherston side, but rain and traffic had washed it down towards Wellington so that it now covered both lanes for an extensive stretch of road.

Clean-up crews were attempting to clear the mess, and police have asked drivers to avoid the area.

Truck drivers had told police it was the biggest such spill they had seen.
*edit* Damn beaten to it by Ronin..... Mods feel free to delete this thread.