Freezing fog occurs when the air temperature is at or below the freezing point, causing water droplets in the fog to remain in liquid form. When these droplets come into contact with surfaces like roads, trees, or vehicles, they freeze instantly, creating a layer of ice. This phenomenon can lead to hazardous driving conditions and reduced visibility. The formation of freezing fog typically happens during calm, humid conditions, often in valleys or low-lying areas. It is most common in winter months and can create beautiful, frosty landscapes, but it also poses risks for travelers and can disrupt daily activities.