What lighting must be on a tractors trailer during lighting-up hours?

1. A.An unloading light.
2. B.Indicators, two white or yellow headlamps and rear number plate lights only.
3. C.Brake lights and indicators only.
4. D.Indicators, brake lights, rear number plate light, red reflectors and rear tail lights.

This is an official-style question from the Managing Risk 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.