Correct answer: B. Front and rear fog lights along with dipped headlights.
When driving in dense fog you should switch on your front and rear fog lights along with dipped headlights. You should not drive in fog with main beam headlights on.
This is an official-style question from the Safe and Responsible Driving topic of the Ireland driver theory test (Cat. B). Practise all 807 questions free on iTest.ie — with timed mock exams, automatic mistake tracking and progress sync across devices.
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