Black ice forms at low precipitation levels where the air temperature is above freezing point and the ground surface temperature is below freezing point.
It means you get the two necessary criteria of a thin ice layer with exact formation over the ground surface and no drying of the top of the ice.
Worth noting that due to the refrigeration effect it will form on bridges, particularly over water, before it forms on solid ground.
Black ice forms at low precipitation levels where the air temperature is above freezing point and the ground surface temperature is below freezing point.
It means you get the two necessary criteria of a thin ice layer with exact formation over the ground surface and no drying of the top of the ice.
Worth noting that due to the refrigeration effect it will form on bridges, particularly over water, before it forms on solid ground.