A spiral roundabout is a roundabout designed with road markings that spiral outward as you drive around it, keeping you in a specific lane for each exit without needing to change lanes on the roundabout itself. You choose the correct lane on approach based on your exit, then the lane markings carry you to it automatically. Spiral roundabouts were introduced by road designers to reduce the lane-changing collisions that occur on conventional multi-lane roundabouts, and they are increasingly common across the UK road network. They sit at the opposite end of the scale from mini and small roundabouts, where the whole junction is too tight for any lane changing at all.
How to tell if it is a spiral roundabout
Spiral roundabouts look like conventional roundabouts from a distance, but once you approach:
- The lane markings on the approach show which lane to take for which exit – usually with arrows and exit numbers
- The road surface inside the roundabout has curved white lane markings that gradually move toward the outer lane as you go around
- Signs on the approach and sometimes on the central island show a diagram of the roundabout with exit numbers
If you see curved lane markings on the roundabout surface itself (rather than the usual dashed circle), you are on or approaching a spiral roundabout.
What are the benefits of spiral roundabouts?
The main benefit is safety. On a conventional multi-lane roundabout, drivers in the inner (right) lane must merge with the outer (left) lane to exit, which causes many side-swipe collisions. Spiral roundabouts eliminate most of this merging by guiding each driver to their correct exit lane through road markings. The result is:
- Fewer lane-change conflicts on the roundabout
- Reduced side-swipe and merging collisions
- Better capacity at busy roundabouts compared with traffic lights
- Clearer guidance for drivers who find conventional multi-lane roundabouts confusing
What is the difference between conventional and spiral roundabouts?
| Feature | Conventional multi-lane | Spiral roundabout |
|---|---|---|
| Lane selection | On approach, may change on the roundabout | On approach only – markings hold you in lane |
| Merging | Required before your exit | Not required – lane guides you out |
| Main collision risk | Side-swipe when merging | Wrong-lane choice on approach |
| Road markings | Standard dashed lines | Curved spiral lines on the roundabout surface |
The driving priority rule is the same on both, and the same as the full roundabout rules: give way to traffic from the right.
Which lane do you use?
The correct lane depends entirely on which exit you are taking, and the lane markings on approach will show this clearly. As a general rule on a four-exit spiral roundabout:
- First exit (sharp left): far left lane on approach
- Second exit (straight ahead): typically left or sometimes right depending on the layout – follow the approach arrows
- Third or fourth exit (right or U-turn direction): right lane on approach
Because the markings vary between specific roundabouts, you must follow the signs and approach markings for that particular junction rather than applying a fixed rule. If you approach in the wrong lane, it is safer to continue to the next exit and re-approach than to cut across lanes on the roundabout.
Do you need to indicate on spiral roundabouts?
Yes – the same signalling rules apply as for any roundabout:
- Signal right if you are taking an exit beyond the 12 o’clock position (i.e. more than halfway around)
- Signal left as you pass the exit before the one you want, to show you are leaving
- Cancel your signal cleanly once you have exited
Some drivers signal less on spiral roundabouts because the lane markings feel self-explanatory, but signalling is still required under the Highway Code and expected by examiners on test. If you are unsure when to signal right, left or not at all, our guide to roundabout signalling breaks it down exit by exit.
Spiral roundabouts on the driving test
If a spiral roundabout falls on your test route, examiners assess whether you:
- Approach in the correct lane for your exit
- Give way correctly to traffic from the right
- Stay in your guided lane without cutting across the markings
- Signal correctly and cancel after exiting
- Check mirrors and blind spots appropriately
The most common error is approaching in the wrong lane due to misreading the signs, then having to cut across on the roundabout. If you do approach wrongly, do not cut across – go around to the next exit.
Our courses cover spiral roundabouts where they appear on local test routes. Our step-by-step process explains how we build roundabout skills from simple priority rules through to complex multi-lane layouts, and if you have never sat behind the wheel, our guide to an intensive course for complete beginners shows where that build-up starts. If you want targeted work on roundabouts and junctions before your test, our Improver course can focus on those specifically, and you can see the full range of course options on our course comparison page. For everything the examiner watches across the full test, see our guide to passing first time.
Frequently Asked Questions
Do you need to indicate on spiral roundabouts?
Yes. Signal right if you are taking an exit beyond 12 o’clock, and signal left as you pass the exit before the one you want. The signalling rules are the same as on any roundabout.
How to tell if it is a spiral roundabout?
Look for curved spiral lane markings on the roundabout surface itself, and for approach signs or road markings showing which lane to use for each exit. Conventional roundabouts have standard dashed white circles; spiral roundabouts have markings that curve outward as you go around.
What are the benefits of spiral roundabouts?
They reduce side-swipe and merging collisions by guiding each driver to their correct exit lane through road markings, removing the need to change lanes on the roundabout itself.
What is the difference between conventional and spiral roundabouts?
On a conventional multi-lane roundabout you may need to change lanes on the roundabout to reach your exit. On a spiral roundabout the road markings carry you to the correct exit once you have chosen the right approach lane, eliminating most mid-roundabout lane changes.