Black ice

At lower temperatures (below −18 °C (0 °F)), black ice can form on roadways when the moisture from automobile exhaust, such as motorcycles and cars, condenses on the road surface.

[5] Such conditions caused multiple accidents in Minnesota when the temperatures dipped below that point for a prolonged period of time in mid-December 2008.

On December 1, 2013, heavy post-Thanksgiving weekend traffic encountered black ice on the westbound I-290 expressway in Worcester, Massachusetts.

The ice formed suddenly on a long downward slope, surprising drivers coming over the crest of a hill, who could not see crashed vehicles ahead until it was too late to stop on the slick pavement.

[7] On February 11, 2021, icing in Dallas and Fort Worth, Texas, contributed to a crash on I-35W which authorities called a "mass casualty event".

In February and in December 1996, the bridge was identified as the single most treacherous cold-weather spot in the local freeway system, because of the almost frictionless thin layer of black ice that regularly formed when temperatures dropped below freezing.

The bridge's proximity to Saint Anthony Falls contributed significantly to the icing problem and the site was noted for frequent spinouts and collisions.

[15][16] When the temperature is below freezing and the wind is calm, such as under high atmospheric pressure at night in the fall, a thin layer of ice will form over open water of a lake.

Furthermore, rime ice may impede the correct functioning of important navigational instruments on board, such as radar or radio installations.