Correct answer: C. Switch on hazard warning lights.
If there is traffic congestion in a tunnel, you should switch on hazard lights and remain patient. Keep a safe distance from the vehicle in front even in slow-moving traffic. Listen for traffic messages on the tunnel radio station, if available.
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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