In this situation, are you obliged to exercise special caution?

Why?

Fog clearly limits visibility in the video, and oncoming vehicles only become visible at close range. Driving when fog or similar conditions reduce visibility requires particular caution. Adjust your speed to how far you can see and watch the road carefully.

art. 30 ust. 1 i art. 19 ust. 1 Prawa o ruchu drogowym