Roundabout Lanes Guide
Mastering lane discipline and the 12 o'clock rule for any UK roundabout.
The 12 O'Clock Rule
When approaching a roundabout, look at the sign and imagine a clock face over it:
- ⬅️ Left Turn (1st Exit): Before 12 o'clock - Left Lane.
- ⬆️ Straight Ahead: At 12 o'clock - Left Lane (unless marked otherwise).
- ➡️ Right Turn: Past 12 o'clock - Right Lane.
The 12 O’Clock Rule
A simple way to choose the correct lane at a roundabout is to imagine the sign as a clock face. If your exit is before 12 o’clock, use the left lane. If it is past 12 o’clock, use the right lane.
For straight-ahead exits at 12 o’clock, the left lane is usually correct unless road markings or signs tell you otherwise.
Roundabout Lane Diagram
Download the visual lane guide PDF.
Used for turning left or going straight ahead (12 o'clock). Check for signs or road markings that may change this.
Used for turning right or doing a full U-turn (past 12 o'clock).
On larger roundabouts, the Middle Lane is often dedicated to the "Straight Ahead" exit to keep traffic flowing.
Look for "Spiral" markings — these will naturally push you toward your exit lane.
The MSM Routine: At Roundabouts
- 🔍 Mirrors: Check early to judge the speed of traffic behind you.
- 💡 Signal: Indicate Left for 1st exit, Right for any exit past 12 o'clock. (No signal for straight ahead until you pass the exit before yours).
- 🚗 Manoeuvre: Position your car early in the correct lane based on the sign.
And it’s not just learner drivers who make these mistakes. We see them every day during driving lessons, so it’s important to stay aware of all road users and never assume other drivers are in the correct lane or signalling properly.
- ⚠️ Choosing the wrong lane: Always check the road signs and lane markings early so you can position correctly before entering the roundabout.
- 💡 Signalling too early: Signalling before the correct exit can confuse other drivers. Signal left only after passing the exit before the one you intend to take.
- 🚫 Cutting across lanes: Stay within your marked lane and avoid drifting across lanes, especially on larger spiral roundabouts.
Roundabout Lanes FAQs
In most cases, you should use the left lane to go straight ahead, unless road signs or lane markings indicate otherwise.
On larger roundabouts with three or more lanes, the middle lane is often used for traffic going straight ahead. Always check the approach signs early to confirm your positioning.
It depends on which exit you are taking. If you are taking the first exit, you should signal left on approach. If you are taking an exit past 12 o'clock, you should signal right.
If you are going straight ahead, you usually do not need to signal as you enter the roundabout.
You should signal left just after you pass the exit before the one you intend to take. This helps other road users and pedestrians understand your intentions clearly.
Stay calm and do not make sudden lane changes or swerve across traffic.
It is usually safer to stay in your lane, take the wrong exit if necessary, or continue around the roundabout until you can leave safely.
You should normally give way to traffic already on the roundabout, especially traffic coming from your right, unless signs, road markings, or traffic lights tell you otherwise.
Spiral lane markings are often found on larger, multi-lane roundabouts. They are designed to guide your car from an inner lane towards your exit lane as you travel around the roundabout.
If you stay within your marked lane, the spiral layout will often guide you out safely without the need to change lanes suddenly.
Recommended Driving Essentials
A few useful products that can help learner drivers improve observation, practise safely, and build confidence when dealing with roundabouts and busy junctions.
The Official DVSA Learning Essentials Pack
The ultimate learner driver bundle featuring official DVSA theory books, hazard perception practice, L plates and P plates - everything you need to revise, practise, and prepare for your driving journey.
View on AmazonLearner Driver Interior Mirror
Useful for private practice with a supervising driver, helping them keep an eye on traffic and support you safely during more complex situations. You will also need one of these if you are taking your driving test in your own car, as the examiner must have a clear rear view.
View on AmazonDash Cam
A high-quality 1080p dash cam with night vision, GPS, Wi-Fi, and instant app access to your recordings. We use cameras like this in our driving school to review lessons and help learners improve their observation, lane discipline, and decision-making on the road.
View on AmazonDiscover more learner driver guides, driving test tips, manoeuvres, and lesson recaps to help you build confidence and pass your test. Visit the Learner Hub
For further reading, we recommend checking the official driving guidance below. These resources are excellent for understanding roundabout rules, lane positioning, and what the DVSA expects during your driving test.These are the same resources we recommend to learners alongside their driving lessons.