What is black ice?

Black ice refers to a thin and transparent layer of ice that forms on roadways, often appearing to be just wet pavement. The reason this is considered hazardous is that it is hard to see, particularly at night or in low-light conditions, which can lead drivers to underestimate road conditions. The term "black" comes from the fact that it is typically found on asphalt surfaces, allowing the dark color of the road to be visible beneath the smooth, glossy layer of ice.

In contrast, other options define different conditions: a thick layer of snow would be a significant accumulation of snow that can impede travel but does not present the same slippery danger as black ice; frozen rain will typically form a layer of ice but is distinct from black ice in terms of formation; and tire skids are the result of a loss of control in driving but do not define what black ice is. Understanding black ice is crucial for safe driving during winter conditions, as it can lead to unexpected slips and crashes if not recognized in advance.