Low beam headlights and fog lights if the vehicle has fog lights.
In fog you should use dipped headlights or front fog lights. Also you should use high intensity rear ( fog) lights.
Adjust your speed to condition, use only your low beams (and fog lights, if so equipped).
Fog Lights only, Low Beam only or Fog Lights + Low Beams.
When its foggy or a snowstorm
When driving in fog it is best to drive with low your light on low beam. This will ensure that you get clear vision. You can use fog lights if you have them on your car and do not speed.
Low beams and fog lights if equipped. High beams only light-up the fog more.
Fog lights
low beam
Low beams
Use the low beams if your car is not equipped with fog lights. It's never recommended to use high-beams in fog, as it makes it about 4x harder to see, and makes the fog look denser.
in the fog
Low beam or fog lamps only.