Theory Mastery

Mist drie seconden afstand niet twee

In very dense fog (visibility under 50 metres) three seconds, not two, applies. When fog forms you adjust your driving straight away; below 50 metres of visibility you even keep three instead of two seconds of distance

Source: RVV 1990 art. 19 · checked 2026-10-23

How the exam asks it

About Fog: why your normal driving habits no longer apply: which statement is WRONG?

  1. In dense fog the normal two-second following distance is still sufficient.
  2. Fog lights help others see you, but change nothing about your own reduced sight; you adjust your driving (speed, distance) regardless, once visibility is severely limited.
  3. You follow the right-hand lane as much as possible, so that in an emergency you can use the hard shoulder as a direct escape route.
  4. Referably do not overtake in dense fog, not even on a motorway.
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Correct answer: In dense fog the normal two-second following distance is still sufficient.

In very dense fog (visibility under 50 metres) three seconds, not two, applies

Why learners get this wrong: As long as your fog lights are on, you don't need to reduce your speed further — others will see you anyway.

Open this question

In very dense fog (visibility under 50 metres) three seconds, not two, applies.

  1. False
  2. True
Show the answer

Correct answer: True

In very dense fog (visibility under 50 metres) three seconds, not two, applies

Why learners get this wrong: In dense fog the normal two-second following distance is still sufficient.

Open this question

About Fog: why your normal driving habits no longer apply: which statement is WRONG?

  1. In very dense fog (visibility under 50 metres) three seconds, not two, applies.
  2. As long as your fog lights are on, you don't need to reduce your speed further — others will see you anyway.
  3. Referably do not overtake in dense fog, not even on a motorway.
  4. You follow the right-hand lane as much as possible, so that in an emergency you can use the hard shoulder as a direct escape route.
Show the answer

Correct answer: As long as your fog lights are on, you don't need to reduce your speed further — others will see you anyway.

Fog lights help others see you, but change nothing about your own reduced sight; you adjust your driving (speed, distance) regardless, once visibility is severely limited

Why learners get this wrong: In dense fog the normal two-second following distance is still sufficient.

Open this question

Fog lights help others see you, but change nothing about your own reduced sight; you adjust your driving (speed, distance) regardless, once visibility is severely limited.

  1. False
  2. True
Show the answer

Correct answer: True

Fog lights help others see you, but change nothing about your own reduced sight; you adjust your driving (speed, distance) regardless, once visibility is severely limited

Why learners get this wrong: As long as your fog lights are on, you don't need to reduce your speed further — others will see you anyway.

Open this question

On the N18 near Groenlo you drive in very dense fog, visibility under 50 metres. How many seconds of distance do you keep to the car ahead?

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Correct answer: 3 sec

Correct: 3.0 sec (±0.5).

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