Which adjustments does the book say you should make in very dense fog (visibility <50 m)? (multiple answers possible)
Not overtake, not even on the motorway
Reduce speed
Keep to the right-hand lane
Keep three seconds' distance instead of two
Simply keep your normal speed as long as your fog lights are on
Explanation
False — trap: visibility-to-others confused with your own sight. Fog lights help others see you, but you reduce your speed regardless (Book p.190-191).