Correct answer
Only if the width of the carriageway is 6.50 metres or less.
It may be used if the carriageway is 6.50 metres wide or less. Use is permitted, not compulsory, on that narrow section with closely spaced bends. The question excludes other reduced-visibility weather or environmental cases; width is not a universal condition for every use of fog lights.
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Only if the width of the carriageway is 6.50 metres or less.
Yes, it must be kept switched on.
No, except if weather conditions are adverse.
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