Amber flashing lights. These signals warn of a hazard ahead. You should
- reduce your speed
- be prepared for the hazard
- only increase your speed when you pass a signal that is not flashing, or a sign displaying a national speed limit or the word ‘END’, and you are sure it is safe to do so.
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.
Car
Lorry & Bus (LGV/PCV)
- What action should you take if there are flashing amber lights under a school warning sign? Other road users
- A lorry is overtaking you on a two-lane motorway. What should you do if it does not have the speed to get past? Braking systems
- What colour follows the green signal at a puffin crossing? Road and traffic signs