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Question 4130

In especially unfavorable weather conditions, such as heavy snowfall, which fog light should we have on?

  1. The rear fog light and, if the vehicle is equipped with one, the front fog light as well.
  2. The rear fog light, and under no circumstances will we turn on the front fog light.
  3. The front fog light, and under no circumstances will we turn on the rear fog light.
Show answer and explanation

Correct answer: The rear fog light and, if the vehicle is equipped with one, the front fog light as well.

In heavy snowfall, the rear fog light is mandatory. The front fog lights are not, but if your car has them, you may turn them on by themselves or together with low beams or high beams. In the image, it is snowing heavily, and the car ahead has its rear fog light on.

Reglamento General de Circulación · Reglamento General de Circulación · Manual I. Normas y Señales (DGT, 2026)