Correct answer
Reduce it enough to stop within the illuminated area.
Reduce it so you can stop within the area illuminated by the dipped beams, under article 107. The question assumes continuing is necessary and safe: if safe travel is impossible, do not continue and request assistance. An unspecified “low” speed is insufficient, and fog lights cannot be used outside authorised situations. Avoid dazzling and repair the fault as soon as possible.
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Maintain any speed provided it is below the maximum limit.
Reduce it enough to stop within the illuminated area.
Increase it to arrive sooner, even if unable to stop within the illuminated area.
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