Animals being herded. These should be kept under control at all times. You should, if possible, send another person along the road in front to warn other road users, especially at a bend or the brow of a hill. It is safer not to move animals after dark, but if you do, then wear reflective clothing and ensure that lights are carried (white at the front and red at the rear of the herd).
Advice, not law. This rule is not written in capitals, so breaking it is not an offence in itself — but it can still be used in evidence in court to establish liability. The rules that say MUST or MUST NOT are the ones backed by law.
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.