Reflective Studs on Motorway
Reflective studs (often called "cat's eyes") are small raised road studs that light up in your headlights. They help you see lane markings and the edges of the carriageway, especially at night or in poor weather. Understanding reflective studs on motorways is essential for passing the DVSA driving theory test and for staying safe on UK motorways and dual carriageways.
Use this Reflective Studs on Motorway guide to learn the key rules for learner drivers, see how they apply in everyday driving, and help you prepare for the UK
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What are reflective studs on motorways?
Reflective studs are small, coloured, reflective markers fixed into the road surface. They help drivers and riders:
- See the lane markings in the dark or in poor visibility.
- Identify the left-hand and right-hand edges of the carriageway.
- Recognise slip roads, lay-bys and junctions on motorways and dual carriageways.
- Spot temporary lane changes and road works.
On your theory test, you'll be expected to know what the different colours of reflective studs mean and how to use them to stay in the correct lane and position on the road.
Key reflective stud rules on motorways
As a learner driver or rider, you need to understand what each colour of reflective stud means and how to use them on motorways and dual carriageways. Here are the key reflective stud rules you should know:
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Use reflective studs to help you keep to the correct lane, especially at night or in poor visibility.
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White studs are used to mark the lanes or the centre of the road between lanes of traffic travelling in the same direction.
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Red studs mark the left-hand edge of the carriageway – use these to avoid drifting onto the hard shoulder or verge.
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Amber studs mark the central reservation (right-hand edge) of a motorway or dual carriageway – they help you avoid getting too close to oncoming or opposing traffic.
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Green studs mark slip roads, lay-bys and some side roads joining or leaving the main carriageway.
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Green/yellow studs are used at road works or temporary lane layouts to show changed lane boundaries – follow them carefully along with any road works signs and lane arrows.
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Remember that reflective studs are a guide only – you must still choose a safe speed, keep a safe following distance and follow all road signs and markings.
These reflective stud rules are based on Rule 132 of the UK Highway Code, which explains the different colours and where they are used on motorways and dual carriageways. Want to see the Highway Code reflective stud rules?
View the Highway Code reflective stud rules.
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Reflective studs on motorways in real driving situations
Reflective studs are not just facts needed to help you pass the UK driving theory test - they're vital for everyday motorway and dual carriageway driving. You'll use them every time you:
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Drive at night or in poor visibility and need help to stay in the correct lane.
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Use red and amber studs to stay safely between the left edge of the carriageway and the central reservation.
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Look for green studs to find slip roads, service areas, lay-bys or places where traffic joins or leaves the motorway.
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Follow green/yellow studs through road works where lanes have been temporarily moved or narrowed.
In your practical driving test, examiners will expect you to use reflective studs sensibly to maintain good lane discipline, especially when driving at higher speeds or in reduced visibility.
Reflective stud theory test questions in the DVSA theory test
Reflective studs appear in the multiple-choice part of the DVSA theory test in several ways. You may be asked:
- Which colour studs mark the left-hand edge of a motorway or dual carriageway.
- Which colour studs are found between lanes or at the central reservation.
- Which studs you'll see at slip roads, lay-bys or service areas.
- What green/yellow studs indicate at road works or temporary lane layouts.
Explore a sample of the latest DVSA theory test revision questions in Driving Theory 4 All's
theory test questions and answers
section.
Source: Department for Transport (GOV.UK) - The Highway Code. Contains public sector information licensed under the Open Government Licence v3.0.