When can you use rear anti-fog lights while driving?
Show the correct answer
Correct answer
C. When visibility during snowfall is less than 50 m.
Explanation
The picture shows a yellow warning light with a lamp symbol and three rays going to the right, crossed by a vertical wavy line - this is the symbol of the rear fog lights. The question is about the conditions in which you may switch them on: when visibility during snowfall is less than 50 m - answer C.
The Road Traffic Act states that a driver may use rear fog lights if reduced visibility limits the distance you can see to less than 50 m, and when visibility improves the driver is obliged to switch them off immediately. The limit is 50 m, and it does not matter what causes it - fog, snow or a downpour. Answers A and B give visibility of 60 m and 100 m, and at such distances the rear fog light is prohibited, because its only job is to let the driver behind you see you in thick fog; in good visibility it is so bright that it dazzles and is confused with a brake light. So you switch them on only when you cannot see anything further than 50 m ahead of you, and switch them off immediately when the fog thins.
Legal basis: Art. 30 para. 3 of the Road Traffic Act (Prawo o ruchu drogowym)