Correct answer
Ventilate and demist the windows appropriately.
Keep windows clear with suitable ventilation and demisting, following vehicle instructions. Direct airflow to the windscreen and use the available demisting functions. If you cannot see sufficiently to drive safely, stop in a safe place. Also adapt speed, increase the gap and use the required lights; clear glass does not remove the external visibility loss caused by fog.
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Ignore misted glass because fog only affects external visibility.
Turn heating to maximum and continue even if the windscreen stays misted.
Ventilate and demist the windows appropriately.
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