Correct answer: D. Avoid carrying unnecessary weight.
The more extra weight is in your vehicle, the more fuel you use. Using a roof rack or a roof box increases wind resistance and this also increases fuel consumption : by as much as 15%. Remove roof racks and roof boxes when not in use.
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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