← General rules, techniques and advice for all drivers and riders
Rule 132: Reflective road studs
Advice, not law
Lines and lane markings on the road (rules 127 to 132)
Reflective road studs may be used with white lines.
- White studs mark the lanes or the middle of the road.
- Red studs mark the left edge of the road.
- Amber studs mark the central reservation of a dual carriageway or motorway.
- Green studs mark the edge of the main carriageway at lay-bys and slip roads.
- Green/yellow studs indicate temporary adjustments to lane layouts, e.g. where road works are taking place.
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)
- You're driving on a motorway. What colour are the reflective studs on the right-hand edge of the carriageway? Road and traffic signs
- You're driving along a motorway in thick fog at night. The reflective studs are red on your left and white on your right. Which lane are you in? The road
- You're driving a long vehicle. What should you be especially careful of before turning left onto a main road? Restricted view