Correct answer
the weather conditions are particularly unfavourable.
A vehicle's rear fog light may only be used when the weather or environmental conditions on the road are particularly unfavourable, such as very heavy rain, very heavy rain, heavy snowfall or dense clouds of dust or smoke. In all other circumstances, its use is completely prohibited.
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the weather conditions are particularly unfavourable.
driving on high-mountain roads.
travelling at an abnormally low speed.
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