Correct answer: A. Switch on the hazard warning lights.
If a driver's vehicle stops in a tunnel due to a breakdown, switch off the engine, switch on the hazard warning lights, check the radio for instructions and use the emergency phone at the emergency station to call for help, check all electronic signs in the tunnel for information.
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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