4804276a_Winter_Cycling_in_Ice_and_Snow__Description
[Classification] Black Ice [Friction Available] The ranges for Black Ice varied from a low of 0.25 to a high of 0.41 Average of 0.32 [Description] 
Icy layer generally covering asphalt, difficult to see by the average driver. Often found on overpasses and elevated structures.
Ice Biking - How to do Winter Cycling in Ice and Snow
Description