[Madmax07]

I live in Saskatchewan so am intimately familiar with black ice. During daylight hours there is literally no way to know if there is black ice on the road other than to tap your brakes to see if you slide, which is not a good idea when pulling a 14,000 lb 5th wheel. At night, you can often tell it’s icy when you meet another vehicle you can see the shiny reflection of the headlights on the road.
My advice is to get off the road ASAP if there is any indication of ice on the road. It’s just not worth driving in icy conditions.