In which of the following cases are you allowed to use the rear fog lights while driving a bus?
Show the correct answer
Correct answer
B. In the fog which limits visibility to a distance shorter than 50 meters.
Explanation
The question is about the situation in which you may use rear fog lights in a bus. You may switch them on in fog that limits visibility to less than 50 m - answer B.
The Road Traffic Act allows rear fog lights to be used only when, in conditions of reduced visibility, you can see for less than 50 m, and requires them to be switched off without delay when visibility improves. Rain alone (answer A) is not enough - what counts is how far you can see. Snowfall limiting visibility to 100 m (answer C) does not meet the condition, because 100 m is more than 50 m. Rear fog lights are very bright: in better conditions they dazzle the drivers behind you and can hide your brake lights. With visibility below 50 m, however, they help others to notice the bus from far away.
Legal basis: Art. 30 para. 3 of the Road Traffic Act (Prawo o ruchu drogowym)