In Italian traffic rules (Codice della Strada), what is the rule regarding the threshold of visibility reduction at which the rear red fog lamp (faro retronebbia) is legally permitted?

Answer and explanation

Correct answer: B. Only when visibility < 50 m

  1. Step 1: Under Art. 153, paragraph 7, the high-intensity rear fog lamp may only be illuminated when visibility drops below 50 metres, and must be switched off when visibility improves. Answer: Only when visibility < 50 m. Why not the others: the other options do not conform to Italian traffic regulations under the Codice della Strada.

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