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.

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