Maintain at least three times the normal following distance on snow or ice. Normal following distance is typically three seconds behind the vehicle in front of you, so on snow, follow five to six seconds behind. Watch carefully for snow removal equipment and stay at least 200 feet behind snow plows.

Melting snow: What to expect this weekend: Snow that melts during the day and creates pools of water on roads and sidewalks. When temperatures drop overnight, these puddles of water freeze into black ice. This scenario is especially common after snowstorms where the sun partially melts snow during the day, but the temperature drops again at night.

Cities that are not accustomed to seeing much snow or ice, like Dallas, could experience significant accumulations.