Black ice

Black ice, also known as glare ice or clear ice, is a type of ice that is transparent and thus appears black because it allows the color of the underlying surface to show through. It is often found on roads, sidewalks, and other paved surfaces, and is particularly dangerous because it is difficult to see and can cause vehicles to skid or pedestrians to slip and fall.

Formation

Black ice forms when the temperature is at or below freezing and there is moisture on the ground. This can occur in a variety of ways, such as when rain or drizzle falls onto a cold surface, or when snow or ice melts and then refreezes. It can also form from dew or fog that condenses onto a cold surface and then freezes. Because black ice is thin and clear, it often goes unnoticed until it is too late.

Dangers

The primary danger of black ice is that it is difficult to see. This can lead to vehicle accidents as drivers may not realize they are on an icy surface until they lose control of their vehicle. Pedestrians are also at risk, as they may slip and fall on the ice. In addition, black ice can form on bridges and overpasses even when the rest of the road is clear, catching drivers off guard.

Prevention and Response

To prevent accidents, it is important to be aware of the conditions that can lead to the formation of black ice and to drive or walk cautiously when these conditions are present. If you encounter black ice while driving, it is recommended to keep the steering wheel straight and avoid sudden braking. If walking, it can be helpful to wear shoes with good traction and to take small steps.

See Also

• Ice
• Winter weather
• Road safety

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Black ice gallery

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  Sudden black ice and frozen puddles in Tauberbischofsheim
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  Road sign Quebec ground frost - Gaspé
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  Icy road bridge
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  I-35W Bridge - April, 2006
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  Black ice river