Correct answer: D. Only during the day.
During daylight hours, you must use a red flag to mark any load that is protruding more than one metre. At night, you must use a red light.
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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