When should a driver use fog lights on their vehicle?

1. A.Switch on fog lights as a warning to pedestrians.
2. B.Use fog lights on a badly lit country road.
3. C.Use fog lights to improve visibility during light rain.
4. D.Use fog lights only in dense fog and falling snow.

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.