Thread: Black ice: the invisible enemy
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Old 02-26-15 | 01:03 PM
  #127  
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Originally Posted by tjspiel
You get black ice when it's below 0º F and water vapor from car exhaust freezes on the pavement. It can be a bright sunny day with dry streets when this happens. Most of our really cold days are bright, sunny, and dry.
You can still see it. It's not "invisible". Rime ice (the type that would form from water vapor freezing out of the air at 0°F) traps a lot of air in it and appears white. True "black" ice is appears as a wet surface because the surface is either wet or it is reflective or both.

Saying that you "were just driving along and hit a patch of black ice that I didn't see" is the motorist's equivalent of a JRA in bicycling.
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