When must a tractor or works vehicle be fitted with a rear-view mirror?

1. A.A rear-view mirror is not required in a tractor or works vehicle.
2. B.A rear-view mirror must always be fitted.
3. C.A rear-view mirror must be fitted only when towing a trailer.
4. D.A rear-view mirror must be fitted only when towing a trailer over 8 metres long.

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.