Rule 46: Roads you must not use
These vehicles MUST NOT be used on motorways (see Rule 253). They should not be used on unrestricted dual carriageways where the speed limit exceeds 50 mph (80 km/h) but if they are used on these dual carriageways, they MUST have a flashing amber beacon. A flashing amber beacon should be used on all other dual carriageways (see Rule 220).
Laws RTRA sects 17(2) & (3), & RVLR regs 17(1) & 26
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.
Car
- Powered vehicles used by disabled people are small and can be hard to see. What must they display if they're travelling on a dual carriageway? Vulnerable road users
- When are you allowed to use hazard warning lights? Incidents, accidents and emergencies
- When may you use hazard warning lights while you're driving? Road and traffic signs
- When should you use hazard warning lights? Hazard awareness