Correct answer: C. When it would be unsafe to do so.
Although a green traffic light means proceed with caution, you should not enter a junction if the way is not clear or if by doing so you would cause an obstruction to other road users.
This is an official-style question from the Legal Matters & Rules of the Road 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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