Finally found my sign on November 21, 2015. Someone who reads this site commented on one of my prior posts about Alberta mud. He described it better than I could as being evil. He is absolutely right. Years ago I can remember my uncle with his farm pickup trying to chisel the mud out of his wheel wells. The high pressure wand wash would not dislodge it.
A little moisture and this road surface will be like the surface of a bar of soap. Very slick.