On a foggy night, you can see that the beams of light coming from the headlights of cars are outlined

On a foggy night, you can see that the beams of light coming from the headlights of cars are outlined in straight lines. How can this be explained?

In this case, the fog is a dispersed system. A dispersed system is a formation of several phases (bodies), between which no reaction occurs and they do not mix. Fog has particles larger than molecules and ions. Because of this, the light is scattered. This phenomenon is characteristic of this system. Therefore, we see these straight lines.