A significant risk of black ice is expected to affect drivers across the northern United States, particularly in areas experiencing sub-freezing temperatures and recent precipitation. Black ice, a thin coating of ice that forms on road surfaces, is often invisible to drivers, making it a hazard. It forms when light rain, drizzle, or melting snow refreezes on roadways. Because it is transparent, it blends seamlessly with the asphalt, making it nearly impossible to see. The northern United States, including states such as North Dakota, Minnesota, Wisconsin, Michigan, and parts of the Northeast, is particularly susceptible to black ice formation during the winter months.