Correct answer: A. Before changing direction.
You should use your mirrors to stay aware of traffic situations behind and around you. Always check your mirror before you change direction on a road, and before you signal or begin a manoeuvre.
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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