[twindman]

I haven't driven on black ice, but something similar. In Iowa (55 years ago!) we had quite a bit of snow that had gotten packed down on county roads. It was about 3-4 inches of hard packed stuff. I was fine driving about 25-35 mph. All of a sudden the car just seemed to drift back and forth going down the road. No apparent changes to cause it. I slowed down to 20 or so and about a mile down the road, it was misting rain. So the mist was freezing on the packed snow and essentially acted like ice.
Not fun.