If you remember one thing about roundabouts in the UK, make it this: give way to traffic coming from your right. That single rule, set out in Rule 185 of the Highway Code, is the foundation everything else is built on. Get your lane and your timing right and a roundabout is just a junction you can flow through without stopping. Get them wrong and it becomes the most stressful 30 seconds of your drive. This guide walks through the lot – priority, lanes, signals, the different sizes you will meet, and the handful of mistakes that catch learners out – the way an instructor would explain it from the passenger seat.
The golden rule: give way to the right
UK roundabouts run clockwise, so the traffic already on the roundabout is always coming at you from the right. You give way to it. You do not have to stop if there is a safe gap – and a big part of driving roundabouts well is learning to keep rolling toward a gap rather than stopping dead at every one.
The Highway Code covers roundabouts across Rules 184 to 190, and Rule 185 is the one that matters most when you arrive: give priority to traffic approaching from your right, unless road markings, signs or traffic lights tell you otherwise. Those exceptions are worth noting. Some roundabouts are signal-controlled at peak times, and a few have markings that let one approach flow without giving way. Read the road, do not just apply the rule blindly.
The other half of Rule 185 is easy to forget under pressure: once you have committed, look forward before you move off to check the car in front has actually gone. Plenty of learners give way correctly, spot their gap, then drive into the back of the car ahead that had not moved. Eyes up.
The clock method: how to pick your lane
The cleanest way to think about which lane you need is to picture the roundabout as a clock face, with your entry at the 6 o’clock position. This is the mental model most instructors teach because it turns a confusing junction into a simple decision.
- Exits before 12 o’clock (roughly the first exit, anything you would call a left turn): approach in the left lane and signal left.
- Exits at 12 o’clock (straight ahead): usually the left lane, no signal on approach, then signal left once you have passed the exit before yours.
- Exits after 12 o’clock (anything you would treat as a right turn, including going full circle): approach in the right lane and signal right, then switch to a left signal after you pass the exit before the one you want.
That maps directly onto Rule 186, which sets out the signals and positioning. The 12 o’clock line is the dividing point: before it, think left; after it, think right. It is not a law in itself, it is a tool for applying the law quickly, and once it clicks you will never be unsure which lane to take on a standard roundabout again.
Going straight ahead
Most roundabout junctions you meet day to day are “follow the road ahead” – the second exit on a standard four-exit roundabout. Here is the sequence:
- No signal on the approach. You are not turning left or right yet, so signalling either way misleads other drivers.
- Approach and stay in the left lane, unless signs or markings tell you to use another lane, or the left lane is blocked.
- As you pass the exit before the one you want, check your left mirror and signal left.
- Leave on your exit, cancelling the signal as you straighten up.
This is the single most common roundabout manoeuvre on a driving test, and examiners are watching for that left signal going on at the right moment – not too early (which suggests you are leaving at the previous exit) and not so late you are already turning off.
Which lane for the second exit?
For the standard straight-ahead second exit, you want the left lane. The exception is when road markings or a sign show the left lane is for the first exit only, in which case the second exit moves to the next lane across. Always trust painted arrows and signs over the general rule – they are there because that particular roundabout does not behave like the textbook one. On a two-lane roundabout where both lanes are marked for straight ahead, either is acceptable, but the left lane is the safer default because it keeps you near your exit.
Two, three and four-lane roundabouts
The give-way rule never changes with size, but lane discipline gets more demanding the wider the roundabout.
Two-lane roundabouts are the everyday case. Left lane for left and straight ahead, right lane for right turns and full circle. The discipline that catches people out is staying in your lane all the way round – drifting from the right lane into the left as you go is how side-swipes happen.
Three-lane roundabouts add a middle lane. As a rule of thumb the lanes line up with the exits: left lane for the earliest exits, middle lane for straight ahead, right lane for the later exits and going right. But on big three-lane roundabouts this is almost always overridden by approach markings, so read the arrows painted on the road and the signs on the approach. They tell you exactly which lane feeds which exit.
Four or more lanes, and you are usually looking at a large gyratory or a spiral roundabout, where the lane markings curve outward and walk you to your exit if you pick the right lane on the way in. On these, the worst thing you can do is change your mind halfway round and cut across lanes. Choose on approach, commit, and if you get it wrong, go round again rather than swerving.
Mini-roundabouts: who goes first?
A mini-roundabout – the painted white circle, sometimes a slightly raised dome – follows exactly the same priority as a full-size one. Give way to the right (Rule 188). Whoever reaches it with a clear right-hand approach goes first.
The wrinkle is that everything happens in a much smaller space and faster, so at a quiet mini-roundabout where several cars arrive at once, it can feel like a polite standoff. The rule still decides it: the car whose right is clear has priority. You are also meant to drive around the central dome rather than straight over it, unless your vehicle is genuinely too long to manage it. We cover the small-roundabout case in full in our guide to mini and small roundabouts.
When do you indicate?
Signalling is where a lot of otherwise-tidy roundabout driving falls apart, so it is worth getting precise. The short version: signal your intention on approach if you are going left or right, never on approach if you are going straight ahead, and always signal left after you pass the exit before the one you want – whichever direction you came in on. That last left signal tells everyone you are leaving. We break the timing down exit by exit, with the common signalling faults, in our dedicated guide to roundabout signalling.
The four mistakes that cost learners
In the DVSA’s published data on why people fail the practical test, junction observation is consistently the single most common fault recorded – and roundabouts are where a lot of those marks are lost. A driving test allows up to 15 minor faults, but just one serious or dangerous fault is an instant fail, and roundabouts produce more than their share. These four are the usual culprits:
- Stopping when you did not need to. Hesitating at a clear gap and stopping dead frustrates traffic behind and can be marked as a fault for undue hesitation. Practise rolling toward the gap so you can go without halting.
- Wrong lane, or wandering between lanes. Picking the right lane on approach is everything. Once you are on, hold your lane all the way to your exit.
- Late, early or missing signals. Signalling left too early makes following drivers think you are leaving sooner; missing it entirely leaves them guessing. The signal goes on as you pass the previous exit.
- Cutting up cyclists and horse riders. This is the one drivers forget. Riders often stay in the left-hand lane and signal right to go all the way round, exactly because the outer edge is safer for them. Give them room and do not assume they are leaving at the next exit.
That fourth point comes straight from Rule 187, which also flags long vehicles and trailers – they may straddle lanes or take an unexpected line because of their length, so read their signals and hang back.
Building real roundabout confidence
You cannot learn roundabouts from a diagram. The give-way rule takes five minutes to understand and a good while longer to do smoothly under pressure, because the skill is in the timing – reading gaps, matching your speed to them, and committing without stalling or panicking. That only comes from driving real ones, repeatedly, with someone next to you who can tell you in the moment whether that gap was safe.
It is the same logic behind a junction like a T-junction: the rule is simple, the judgement is what takes practice. On an intensive course we build that judgement deliberately, starting on quiet mini-roundabouts and working up to multi-lane ones in traffic, so by test day you are reading them on instinct. If you have never driven at all, our guide to an intensive course as a complete beginner explains how that build-up is paced from the very first hour. Our step-by-step process shows how that progression works, and if you have already had lessons but roundabouts are the thing letting you down, our Improver course lets us target exactly that. For the wider picture, our guide to passing your driving test first time puts roundabouts in context with everything else the examiner is watching.
Frequently Asked Questions
What is the golden rule of roundabouts?
Give way to traffic approaching from your right. UK roundabouts flow clockwise, so traffic already on the roundabout comes from your right, and you give way to it unless signs, road markings or traffic lights direct otherwise. This is set out in Rule 185 of the Highway Code.
What is the 12 o’clock rule for roundabouts?
It is a method for choosing your lane. Picture the roundabout as a clock with your entry at 6 o’clock. For any exit before 12 o’clock, approach in the left lane and signal left. For 12 o’clock (straight ahead), use the left lane with no approach signal. For any exit after 12 o’clock, approach in the right lane and signal right, then signal left after you pass the exit before yours.
Which lane do I use for the second exit on a roundabout?
On a standard roundabout the second exit is usually straight ahead, so use the left lane, give no signal on approach, and signal left only after you have passed the first exit. The exception is when road markings or signs assign the left lane to the first exit alone, in which case follow the painted arrows instead.
Who goes first at a mini-roundabout?
The same rule applies as at any roundabout: give way to the right. Whoever has a clear approach from their right goes first. At a busy mini-roundabout where cars arrive together, the vehicle whose right-hand side is clear takes priority. You should drive around the central dome rather than over it unless your vehicle is too large.
What are the most common roundabout mistakes on a driving test?
The frequent ones are stopping at a gap you could have taken (undue hesitation), choosing the wrong lane or drifting between lanes, signalling too early or too late, and failing to give cyclists and horse riders enough room. Junction observation is the most commonly recorded fault in the DVSA’s data, and roundabouts are a common place to lose those marks.