The roads last night were perhaps the slipperiest I've ever driven on.
Then again I was in the truck with the xfer case locked in 4x4 instead of a Subaru, so that may have made things feel worse than they were... but it was a half inch of black ice covered by a half inch of snow down here on the south end of town around 8 pm.
I was chasing the back end of the truck the whole way to BJ's and back... which is kinda like driving in slow motion since the truck's wheelbase is so long.