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Black ice
01
a thin, nearly invisible layer of ice on a road surface, often causing dangerous driving conditions
What is "black ice"?
Black ice is a thin, nearly invisible layer of ice that forms on roads, sidewalks, and other surfaces when temperatures drop below freezing. It is called black ice because it is so clear that the dark surface underneath, such as asphalt, can be seen through it. Since it is difficult to notice, it can be very dangerous for drivers and pedestrians, as it makes surfaces extremely slippery. Black ice often forms at night or early in the morning, especially on bridges, overpasses, and shaded areas where the ground stays colder for longer.
Example
He warned drivers about the black ice on the bridge.
They treated the roads to prevent the formation of black ice.
She skidded on black ice and nearly lost control of her car.
