Correct answer
Yes, reduce it to suit the visible distance ahead.
Adapt speed to the visible distance and fog density so you can stop before an obstacle within that distance. Increase following distance and use appropriate lighting. Do not start an overtake without sufficient visibility and margin; fog alone does not establish an absolute ban on every overtake, for example in same-direction lanes without entering opposing traffic. Markings help guide you but do not justify an unsafe speed.
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All options
No, it is not necessary.
Only if the fog is very dense.
Yes, reduce it to suit the visible distance ahead.
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