Correct answer: B. When broken down and causing an obstruction.
Use the hazard warning lights to warn other road users of a danger ahead. For example, if a driver’s vehicle is causing an unavoidable obstruction such as being broken down, they should use the vehicle’s hazard warning lights to warn other road users of their presence.
This is an official-style question from the Managing Risk 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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