Correct answer: A. They could mistake the vehicle for a motorcycle.
Motor vehicles (except motorcycles) are required by law to have two headlights. A vehicle with only one headlight could be mistaken for a motorcycle and other road users could believe that it is in a different position on the road than it actually is. Vehicle lights should be checked on a regular basis and repair faulty lighting immediately.
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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