Rule 43: Lights, indicators and horns
You MUST follow the same rules about using lights, indicators and horns as for other road vehicles, if your vehicle is fitted with them. At night, lights MUST be used. Be aware that other road users may not see you and you should make yourself more visible - even in the daytime and also at dusk - by, for instance, wearing a reflective jacket or reflective strips on the back of the vehicle.
Law UICHR reg 9
Why the capitals matter. The Highway Code writes a rule in capitals — MUST or MUST NOT — when it is backed by law, so breaking it is a criminal offence. The rules that do not use capitals are advice.
5 theory test questions on this rule
From the DVSA revision question bank. These are not the questions asked in the real theory test. Each one shows the answer, the explanation, and our own note on why every other option is not it.