I was heading into the cities and hit black ice as I crossed the St. Croix River. It was -7F (-21C) as I entered the bridge. I never saw the black ice. Luckily, there were no vehicles next to me as the back end of the truck started to slide. I was able to correct and keep going, but wow.
Note to anyone driving an overpowered truck (7.3-liter V8) in winter, put it in “Slippery – Snowy” mode. Slippery mode lowers throttle response and optimizes shifting for slippery surfaces, according to Ford. I forgot about this mode, until I returned to Wisconsin. The drive back was easy and uneventful.