Fog creates dangerous driving conditions. It reduces visibility, makes it hard to spot hazards, and it becomes difficult for a driver to judge distance. The unusual weather condition can create optical illusions. Drivers may misjudge their own speed or have a hard time determining if other cars are moving.
Fog is a cloud formation near the surface of the earth. It's common near lakes and the coastline in the morning or evening. It can form at other times and other places. Check your local weather forecast before driving.
When possible, do not drive in foggy conditions. Dense or light fog is a major cause of accidents, including pile-ups. If you cannot avoid driving in fog, here are some tips to ensure safe driving.