Commercial Driver License (CDL) Class B Practice Test

What is commonly referred to as "black ice"?

1. A slick layer of ice that is transparent

2. A type of asphalt used on roads

3. A coating of oil on the road

4. A layer of frost on grass

The correct answer is: A slick layer of ice that is transparent

"Black ice" refers to a slick layer of ice that is transparent, making it particularly hazardous for drivers. This type of ice forms when moisture freezes on the road surface, and because it is clear, it blends with the asphalt beneath it. As a result, drivers may not see it until they are already on it, significantly increasing the risk of losing traction and control of the vehicle. The transparency of black ice is what makes it so deceptive; it can make roads appear simply wet instead of icy. This can lead to dangerous driving conditions as motorists underestimate the level of hazard present. Other options presented do not accurately describe black ice. For example, asphalt is a material for road construction, while a coating of oil on roads can create slipperiness but does not involve ice. Lastly, a layer of frost on grass pertains to temperatures affecting the ground but does not relate to icy road conditions for vehicles. The unique properties of black ice necessitate that drivers remain vigilant, especially in colder weather or on shaded roads where ice tends to form.