Theory Mastery

Mistachterlicht bij mist sneeuw zicht 50m

The rear fog light is reserved for very dense fog or heavy snowfall (visibility <50 m). The rear fog light is stricter: that is only allowed when visibility is less than 50 metres due to very dense fog or heavy snowfall, never due to rain.

Source: RVV 1990 art. 32 · checked 2026-10-23

How the exam asks it

You are driving through a heavy rain shower on the road to the ferry terminal in Breskens. Visibility is poor, the road surface is mirror-slick from the water. May you switch on your rear fog light now?

  1. No, the rear fog light may not be used in rain, not even heavy rain
  2. Yes, with such poor visibility it is allowed, just like in fog
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Correct answer: No, the rear fog light may not be used in rain, not even heavy rain

You may never use the rear fog light in rain, however heavy; it is reserved for very dense fog or heavy snowfall

Why learners get this wrong: During heavy rain showers you may switch on your rear fog light, just like in fog, to be more visible to following traffic.

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You may not switch on the rear fog light in rain, not even during heavy rain showers: the bright red light and its reflection actually hinder following traffic.

  1. False
  2. True
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Correct answer: True

You may not switch on the rear fog light in rain, not even during heavy rain showers: the bright red light and its reflection actually hinder following traffic. The rear fog light is reserved for very dense fog or heavy snowfall (visibility <50 m)

Why learners get this wrong: During heavy rain showers you may switch on your rear fog light, just like in fog, to be more visible to following traffic.

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About Fog-light rule: rain versus fog: which statement is WRONG?

  1. You may not switch on the rear fog light in rain, not even during heavy rain showers: the bright red light and its reflection actually hinder following traffic.
  2. As soon as it rains, you are required to switch on your front fog light, just like your dipped beam.
  3. Only use the rear fog light if it improves safety; if following traffic has already seen you, the bright rear fog light actually hinders them. 'Keep it on until the fog is gone' is not a book rule.
  4. Only switch on the rear fog light when it is better for safety; if following drivers have already seen you, the bright light is a nuisance to them.
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Correct answer: As soon as it rains, you are required to switch on your front fog light, just like your dipped beam.

Dipped beam is always mandatory in rain; the front fog light may only be switched on during heavy rain that seriously impairs visibility (visibility less than about 200 m). In ordinary light rain the front fog light is not required

Why learners get this wrong: During heavy rain showers you may switch on your rear fog light, just like in fog, to be more visible to following traffic.

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In very dense fog near Breskens, visibility drops sharply. At how many metres of visibility (or less) may you switch on the rear fog light according to the book (in metres)?

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Correct answer: 50 m

Correct: 50.0 m (±10.0).

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Heavy rain is falling on the road to the ferry terminal in Breskens; visibility is poor. May you switch on your rear fog light now?

  1. No, the rear fog light is prohibited in rain, however heavy
  2. Yes, with such poor visibility rain counts just like fog
Show the answer

Correct answer: No, the rear fog light is prohibited in rain, however heavy

Why learners get this wrong: During heavy rain showers you may switch on your rear fog light, just like in fog, to be more visible to following traffic.

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