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Collision type · Roundabout
Roundabout collisions in the UK turn on Highway Code rules 184 to 190 - approach, give-way to the right, lane discipline, signalling and the mini-roundabout rule at 188. This page sets out the rules, the recurring collision patterns, the apportionment splits insurers actually apply, and the evidence chain that decides each file.
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Stop the vehicle, switch on hazards and check for injury. Photograph every vehicle's position on the circulatory carriageway and the painted lane arrows on each approach lane before vehicles are moved - lane discipline is what most roundabout disputes turn on. Back up the dashcam clip within 24 hours. Exchange names, addresses, vehicle registration marks and insurer details under section 170 of the Road Traffic Act 1988. Note witness contact details, especially kerbside witnesses with a clear sight-line. Report to the police within 24 hours where injury was caused or details could not be exchanged. Send CCTV preservation letters to the local authority, National Highways and any relevant bus operator inside the 14 to 28 day retention window. Then open the accident-management file.
UK roundabouts are governed by Highway Code rules 184 to 190, by the priority and lane-discipline rules they set out, and by the underlying Road Traffic Act 1988 duties that attach to every UK road user. Roundabout files cluster around a small number of recurring collision patterns - failure to give way on entry, side-swipe on the circulatory carriageway, rear-end shunt on exit, lane-cutting across solid markings, signal-failure entry collisions and mini-roundabout U-turn impacts. Liability apportionment runs three common ways: 100/0 against the driver who plainly crossed a marking or ran a signal, 70/30 where one driver was predominantly at fault but the other contributed, and 50/50 where two drivers side-swiped on the circulatory carriageway and neither can show the other crossed a line first. This page sets out the rules, the patterns, the evidence chain and the route into a CityGrip file.
The Highway Code roundabout rules run from 184 to 190. Rule 184 covers the approach: a driver should use Mirrors-Signal-Manoeuvre, adjust speed and position, watch out for vehicles already on the roundabout and give way to traffic approaching from the immediate right unless road markings or signals say otherwise. Rule 185 reinforces the priority-to-the-right rule on entry. Rule 186 sets the default lane discipline - left lane for exits left of 12 o'clock with a left signal on approach, left lane (or as marked) for the straight-ahead exit with no approach signal and a left signal after passing the exit before the one you want, and the right-hand lane for exits past 12 o'clock or going right round with a right signal on approach.
Rule 187 deals with signalling more broadly and with looking out for cyclists, motorcyclists, horse-riders, pedestrians and large vehicles already on the roundabout. Rule 188 governs mini-roundabouts - same priority rule as a full roundabout, all vehicles to pass round the central marking where physically possible, beware of drivers making U-turns. Rule 189 covers double mini-roundabouts (two mini-roundabouts at one junction, each treated separately). Rule 190 covers multiple-roundabout junctions of the magic-roundabout type. Breaches of any of these advisory rules are not themselves criminal offences but are expressly admissible in any civil or criminal proceedings under section 38(7) of the Road Traffic Act 1988 to establish liability.
The give-way-to-the-right rule under rule 185 is the foundation of UK roundabout operation. A driver entering a roundabout gives way to any vehicle approaching from the immediate right on the circulatory carriageway. The rule applies whether the roundabout is full-sized, mini, signalised (where the signals are out of operation) or part of a magic-roundabout cluster. The rule is not displaced by which approach arm carries more traffic, by the relative size or status of the vehicles, or by any informal convention. Painted give-way markings on each approach lane reinforce the rule. Where the signals at a signalised roundabout are in operation, the signal-phase overrides the give-way rule and the right-of-way is defined by the lights rather than by the immediate-right principle.
Failure-to-give-way collisions on entry are the single most common pattern on UK roundabout files. They typically settle 100/0 against the entering driver where dashcam or junction CCTV shows the entering vehicle clearly moved onto the circulatory carriageway while a vehicle on the right was already there. Liability shifts toward a 70/30 split where the circulating driver was travelling above a safe speed for the junction, or where the circulating driver was indecisively positioned (drifting between lanes, or signalling left then continuing). The speed-of-approach element is rarely decisive on its own - the entering driver's give-way duty is absolute under rule 185 - but it can contribute to an apportionment shift where causation is genuinely shared.
Lane-discipline disputes are the second-most-common pattern on UK roundabout files. Two drivers side by side on the circulatory carriageway each plan to leave at a different exit. The inner-lane driver crosses the outer-lane driver's path to reach their exit; the outer-lane driver was either continuing past their entitled exit or was occupying the outer lane on the approach to an exit past 12 o'clock that should have been taken from the inner lane. Both behaviours breach rule 186. The fault question becomes: which driver crossed which line first, and which driver was entitled to be in their lane at the moment of impact?
Insurer apportionment patterns on these files settle around three findings. Where the inner-lane driver had signalled left and was visibly leaving, and the outer-lane driver had drifted from outer to inner without signalling, the apportionment is commonly 70/30 against the outer-lane driver. Where the painted lane arrows on the approach clearly directed the outer-lane driver to the first exit only - and the outer-lane driver continued past it - the apportionment can move to 100/0 against the outer-lane driver. Where the arrows on the approach permit either driver to use either lane for the relevant exit (a common layout in older roundabouts in Bristol, Newcastle, Cardiff and Edinburgh that were laid down before lane-by-exit marking became standard), a 50/50 split is the default unless dashcam shows one vehicle crossing a solid line first.
ROUNDABOUT
Section 3 of the walkthrough.
A mini-roundabout is a one-way circular junction with a painted or low-profile central dome no more than four metres across, signed with the mini-roundabout warning sign. Rule 188 of the Highway Code applies the same priority rules as a full roundabout - give way to traffic from the right - and requires drivers to pass round the central marking except where their vehicle is too large to do so physically. Mini-roundabouts are common in residential areas and at low-flow secondary junctions across Bristol, Newcastle, Leeds, Norwich, Cardiff, the Yorkshire Dales market towns and the Lake District tourism towns. The geometry is tighter, speeds are lower and U-turns are explicitly cautioned against under rule 188 itself.
Mini-roundabout collisions divide into two distinct patterns. The first is the cross-traffic failure-to-give-way - a driver entering treats the painted dome as a priority junction rather than a roundabout, and fails to give way to a vehicle from the right. The second is the U-turn collision - a driver doing a U-turn through the mini-roundabout is struck by a driver entering from the opposite arm who reasonably assumed no U-turn was being performed. Rule 188 expressly warns of the U-turn pattern, and the apportionment on these files commonly runs 70/30 or 80/20 against the U-turning driver. Mini-roundabouts in residential streets generate a steady volume of low-speed damage-only files; the OIC portal is the routine route for any associated soft-tissue injury under £5,000.
A magic roundabout is a cluster of mini-roundabouts arranged around a central circulatory carriageway that can be traversed in either direction - drivers route through the outer mini-roundabouts in whichever direction reaches their exit fastest. The best-known UK example is Swindon's Magic Roundabout, opened in 1972 at the junction of County Road, Drove Road, Fleming Way, Shrivenham Road and Queens Drive. It comprises five outer mini-roundabouts arranged around a counter-rotating central inner ring. The Plough Roundabout in Hemel Hempstead, built in the early 1970s, uses a similar layout with six outer mini-roundabouts. Both are governed by rule 190 of the Highway Code, which treats each individual mini-roundabout as a separate junction at which the give-way-to-the-right rule applies.
Magic-roundabout files generate a distinct evidence pattern. Drivers unfamiliar with the layout - typically out-of-town drivers, commercial vehicle drivers passing through Swindon on the M4 corridor, or holiday drivers heading toward Hemel Hempstead from the M1 - mis-track between the outer mini-roundabouts and either cross the path of a local driver or fail to give way at one of the individual junctions. Local-authority junction CCTV from Swindon Borough Council and Dacorum Borough Council is the routine evidence pull; both councils retain footage for approximately 28 days. The apportionment patterns mirror those at any other mini-roundabout cluster - typically 70/30 or 100/0 against the driver who failed to give way at the relevant individual mini-roundabout.
Many of the largest UK roundabouts are signalised - Marble Arch in central London, the M25 J28 Brook Street interchange in Essex, the A14 J23 Spittals interchange in Cambridgeshire, the Bristol Temple Way roundabout, the Leeds Armley Gyratory and the Edinburgh Sheriffhall roundabout among them. At a signalised roundabout the traffic-light phase overrides the give-way-to-the-right rule. A driver on a green light entering the circulatory carriageway has priority over a driver on the carriageway facing a red. Where the signals are operating normally, the signal-phase data - recoverable from the highway authority via FOI - is usually the conclusive evidence on a contested liability file.
Signal-failure scenarios produce a separate pattern. Where the signal heads are completely dark - a power loss or a confirmed fault - the underlying rule 185 give-way-to-the-right rule revives, and drivers must treat the junction as an unsignalised roundabout. Where the signals are flashing amber, drivers must proceed with extreme caution, slowing to a near-stop and giving way to any vehicle already on the junction. Where one head is dark and another is operating, the file turns on which signal the relevant driver was facing and whether that signal was operating. The signal-fault log maintained by the highway authority - Transport for London for the Marble Arch junction, National Highways for the M25 J28 - is recoverable inside a 28 to 90 day cycle via FOI request and routinely settles the liability question.
UK roundabout files cluster around six recurring patterns. The first and most common is failure-to-give-way on entry - an entering driver moves onto the circulatory carriageway in front of a vehicle approaching from the immediate right, in breach of rule 185. The second is the side-swipe on the circulatory carriageway, where an outer-lane driver and an inner-lane driver each plan to leave at a different exit and one crosses the other's path in breach of rule 186. The third is the rear-end shunt on exit, where a vehicle on the circulatory carriageway brakes suddenly on approach to its exit (often because the driver in front is unfamiliar with the layout) and the following driver fails to anticipate, in breach of rule 126 on stopping distances.
The fourth pattern is lane-cutting across solid markings - a driver crosses a solid white line on the approach lane to reach a different lane for their intended exit, typically because they realised at the last moment they were in the wrong lane. The fifth is the signal-failure entry collision at a signalised roundabout, where one or more signal heads is dark and drivers operating from different rules disagree about priority. The sixth is the mini-roundabout U-turn impact under rule 188, where a driver U-turns through the painted central dome and is struck by a driver entering from the opposite arm. CityGrip records the collision pattern at intake and routes the evidence chain accordingly - dashcam first, junction CCTV preservation letter second, witness statements third, signal-fault FOI fourth where relevant.
Roundabout evidence has three distinctive features that differ from other collision scenarios. The first is the importance of the painted lane markings. Lane-discipline disputes turn on which lane each driver was supposed to be in and whether the painted arrows on the approach lane authorised that driver's intended exit. The markings are not permanent - local highway authorities repaint solid lines on a three-to-five year cycle and refresh painted arrows as part of routine resurfacing. The markings present on the day of the collision may differ from the markings present six months later. Photographs taken at the scene fix that evidence; photographs taken months later do not.
The second is witness placement. A witness in a stopped vehicle on the carriageway has a different sight-line view from a pedestrian on the kerb, and often a less useful one - the pedestrian can see the approach lanes, the circulatory carriageway and the give-way markings simultaneously, whereas the vehicle-bound witness sees only their own line of sight. Witness statements from kerbside witnesses are weighted more heavily in lane-discipline disputes than statements from in-vehicle witnesses. The third is dashcam approach-speed evidence: most front-facing dashcams record GPS speed alongside the video, which directly addresses any speed-of-approach element in the apportionment analysis.
Where the roundabout is grade-separated (typically an M25 junction or a trunk-road interchange under National Highways management), gantry CCTV from the approach roads, ANPR data from the entry and exit slip roads, and traffic-flow sensor data from the inductive loops in the carriageway are all recoverable via FOI. National Highways retains gantry CCTV for around 14 days; the inductive-loop data is held longer but is not customarily released without a specific request. CityGrip drafts the FOI and preservation letters at intake on grade-separated roundabout files.
Major UK motor insurers - Aviva, AXA, Allianz, Direct Line, Admiral, Hastings, LV=, RSA, Esure, Saga, Churchill - apply broadly consistent apportionment patterns on UK roundabout files. A 100/0 split against one driver applies where dashcam, CCTV or independent witness evidence shows that driver clearly crossed a solid lane marking, ran a red signal at a signalised junction, entered without giving way to a vehicle plainly on the right, or struck a stationary vehicle ahead. A 70/30 split typically applies where one driver was predominantly at fault but the other contributed materially - for example, where the entering driver failed to give way but the circulating driver was travelling above a safe speed for the junction, or where the inner-lane driver was leaving without a left signal but the outer-lane driver was past their entitled exit.
A 50/50 split is the default where two drivers in adjacent lanes side-swiped on the circulatory carriageway and neither party can show the other crossed a lane line first. Lane-discipline breaches under rule 186 are the most common reason for a split to move from 50/50 toward 70/30 or 100/0 - the painted arrows on the approach often establish a clear lane entitlement that one driver demonstrably ignored. Speed-of-approach evidence, when captured by dashcam GPS, can shift a split by 10 to 20 percentage points where the entering driver's give-way duty was met but the circulating driver's speed was unreasonable in the conditions. Contributory negligence findings under the Law Reform (Contributory Negligence) Act 1945 are explicit in every disputed file.
The process for a UK roundabout collision claim mirrors any other UK road-traffic claim, with three roundabout-specific overlays. Step one is the immediate scene response - section 170 exchange, dashcam back-up, scene photographs, witness details and police reporting where required. Step two is the accident-management instruction - recovery from the scene under PAS 43 to a secure storage site, instruction of an independent engineer to determine the ABI Salvage Code category (A, B, S or N), instruction of like-for-like credit hire under Lagden v O'Connor [2003] UKHL 64 with the like-for-like principle confirmed in Bee v Jenson [2007] EWCA Civ 923, and notification to the driver's own insurer for information purposes. Where credit hire is not available - usually because the impecuniosity test fails or no GTA-classified comparator is to hand - a loss of use claim is the fallback recovery route for the period off the road. Where the vehicle is repaired but its open-market resale value is permanently impaired by the recorded incident, a diminished value claim covers the residual loss.
Step three is the property-damage claim against the at-fault driver's insurer under section 151 of the Road Traffic Act 1988. The third-party insurer's liability investigation takes between two and six weeks on a clear file, longer where lane discipline is disputed. Step four is the personal-injury route - for whiplash-band injuries under £5,000 in general damages, the claim runs through the Official Injury Claim portal under the Civil Liability Act 2018 and the Whiplash Injury (Amendment) Regulations 2025 SI 2025/615 - the duration-banded figures are set out in full on our whiplash compensation guide. For more serious injury, contested liability, or claims involving children or protected parties, an SRA-regulated solicitor takes the file as a full personal injury claim after a car accident - typically on a no win, no fee CFA - with the referral arrangement disclosed under CMCOB 6 and CMCOB 7 at the point of instruction. The three-year limitation period under section 11 of the Limitation Act 1980 still applies on the OIC and solicitor routes alike.
Step five - for non-fault drivers - is settlement and recovery of the credit-hire, repair, storage and engineer costs from the at-fault insurer. Step six is the signed file closure with the CMCOB 4.3.1R(1A) standalone disclosure recorded, the charge schedule provided to the customer in writing and any onward solicitor handling complete. The whole process typically takes between eight and twenty weeks on a roundabout file with clear liability, longer where apportionment is disputed between insurers.
This roundabout page sits under the UK collision-types hub and alongside the sibling scenario pages for rear-end shunts, junctions and lane-change collisions. Where the third party in a roundabout collision is a private hire vehicle - a common pattern on the airport approach roundabouts at Heathrow, Manchester and Birmingham - the cross-vertical minicab hub is the relevant route.
The parent hub linking to twenty-four UK collision scenario sub-pages.
Top-level UK car accident claim hub covering the entire non-fault driver workflow.
End-to-end non-fault claim coordination - recovery, storage, engineer, credit hire and repair.
Sibling scenario - following-too-closely collisions under Highway Code rule 126.
Sibling scenario - T-junctions, crossroads and signal-controlled junctions.
Sibling scenario - side-swipe and merge collisions on dual carriageways and motorways.
Cross-vertical hub - relevant where the third party is a private hire vehicle.
Ranking factors
The six factors that distinguish a strong UK roundabout collision claim from a weak one. Adapted from the universal collision factors with roundabout-specific evidence and statute references. CityGrip handles each file on a claim-by-claim basis, not by scenario template.
Roundabout files settle faster where the scene photographs, dashcam clip, witness contact details and section 170 exchange are completed inside 72 hours. Lane markings are non-replicable evidence - the highway authority repaints solid lines and refreshes painted arrows on its own cycle, and the markings in place on the day of the collision may differ from the markings in place six months later when the third-party insurer asks for evidence. Capturing the scene at the time fixes the dispute.
Window: 0-72 hours
Roundabout claims plead Highway Code rules 184 to 190 (the roundabout rule set), section 38(7) of the Road Traffic Act 1988 (admissibility of Highway Code breaches), section 170 (at-scene duties), the Civil Liability Act 2018 and Whiplash Injury (Amendment) Regulations 2025 (SI 2025/615) for the injury element, the Limitation Act 1980 sections 11 and 2 for the time limits and the Law Reform (Contributory Negligence) Act 1945 where both drivers contributed. A file built on these references on day one moves cleanly through the at-fault insurer's process.
Authority: legislation.gov.uk + gov.uk/highway-code
Local authority junction CCTV typically retains for 14 to 28 days. National Highways gantry footage at grade-separated roundabouts holds around 14 days. Bus-mounted CCTV from First Bus, Stagecoach, Arriva and Lothian Buses retains 14 to 30 days operator-by-operator. Signal-phase data from a signalised roundabout is recoverable via FOI from the highway authority but is typically purged on a 28 to 90 day cycle. Preservation letters must go out inside the retention window or the evidence is gone.
Window: 14-28 days for most CCTV
CityGrip handles the property-damage chain under FCA CMCOB authorisation - recovery, storage, credit hire, engineer instruction, repair coordination and direct dialogue with the at-fault insurer. Personal-injury work is referred to an SRA-regulated solicitor under CMCOB 6 and CMCOB 7 with the referral arrangement disclosed in writing. The CMCOB 4.3.1R(1A) standalone disclosure - confirming the customer is not obliged to use a claims management company - is rendered on the page before any instruction.
Reference: FCA CMCOB 4, 6, 7
Lane discipline disputes turn on the painted arrows in the lane on the day of the collision, the position of the broken-versus-solid lines on the circulatory carriageway, the signal-phase at a signalised junction, and the position of the give-way line at each approach. A mini-roundabout file under rule 188 reads differently from a magic-roundabout file at Swindon or Hemel Hempstead. CityGrip records the scenario particulars at intake - full, mini, signalised, magic, grade-separated - so the right evidence chain runs from day one.
Method: claim-by-claim, not template
CityGrip Accident Claims (Citygrip LTD) is the accident-management entity. Independent engineers, PAS 43 recovery operators, BS 10125 / PAS 125 certified bodyshops and SRA-regulated panel solicitors are named on the file at the point of referral. Every onward referral is disclosed in writing with the referral fee position made explicit. The Highway Code itself is the gov.uk-published statutory and advisory rule set; legislation.gov.uk is the canonical source for every Act cited.
Disclosure: SRA + FCA + ABI panels
Step one secures the scene; step six routes the file to the right onward chain. The roundabout-specific overlay is in steps two and five - the lane markings are the non-replicable evidence, and the CCTV preservation window is short.
Step 1
Stop, secure the scene and check for injury
Stop the vehicle on the circulatory carriageway or move to the nearest safe verge if the layout allows. Switch on hazards. Check yourself, passengers and the occupants of every other vehicle for injury. A roundabout collision often blocks one or more approach lanes; do not exit the vehicle into live traffic on a busy circulatory carriageway. Where injury is present, where details cannot be exchanged or where any animal listed in section 170(8) of the Road Traffic Act 1988 is involved, call 999. Otherwise call 101 or use the local force's online collision-reporting portal within 24 hours.
Step 2
Photograph the lane markings and vehicle positions before anything moves
Roundabout liability turns on lane discipline, so the lane markings are the single most important piece of physical evidence. Photograph the painted arrows on each approach lane, the lane numbers if present, the solid versus broken lane lines on the circulatory carriageway and the location of each vehicle in its lane at the moment of stopping. Take at least three angles per vehicle. Photograph the direction signs on each approach, the give-way markings, the central island and any signal heads. Note the time to the minute and the weather conditions.
Step 3
Back up the dashcam clip within 24 hours
Most dashcams in continuous-recording mode loop their oldest footage within 12 to 24 hours. Save the clip covering the 60 seconds before and after impact to two locations - cloud storage and a second physical device. Note the clock-time stamp on the clip and the camera's recording resolution. Where the camera captures both front and rear, extract both views. Where another vehicle in the queue had a dashcam, ask the driver immediately for a copy before they leave the scene - once the witness has driven away, the second-camera evidence is almost always lost.
Step 4
Exchange details under RTA 1988 section 170 and capture witness contact details
Every driver involved must give their name, address, vehicle registration mark and (where requested) the name and address of the insurer. Where the vehicle is not owned by the driver, the owner's name and address are also required. Note the contact details of every witness, including witnesses in stopped vehicles and pedestrians at the kerb - a kerbside witness has a different sight-line from a vehicle-bound witness and is often the more useful witness on a lane-discipline dispute. Capture phone numbers, not just names.
Step 5
Send CCTV preservation letters inside the retention window
Local authority junction CCTV typically retains for 14 to 28 days. National Highways gantry CCTV (on large grade-separated roundabouts like the M25 J28 Brook Street or the A14 J23 Spittals interchange) holds for around 14 days. Bus-mounted CCTV from First Bus, Stagecoach, Arriva, National Express West Midlands or Lothian Buses retains operator-by-operator, typically 14 to 30 days. A preservation letter sent inside the retention window secures the footage; a request sent later is almost always met with a deletion-already-occurred response. CityGrip drafts the preservation letters at intake.
Step 6
Open the accident-management file and instruct an independent engineer
Open the file with an accident-management company at the earliest opportunity. Recovery from the scene under PAS 43 to a secure storage site protects the vehicle for the engineer's report. An independent engineer determines the ABI Salvage Code categorisation (Cat A, B, S or N) on neutral ground, before the at-fault insurer's chosen engineer sets a reserve. Like-for-like credit hire under Lagden v O'Connor [2003] UKHL 64 keeps the driver mobile while the property-damage claim moves. Personal-injury work is referred to an SRA-regulated panel solicitor under CMCOB 6 and CMCOB 7 with the referral arrangement disclosed in writing at the point of instruction.
Highway Code rules 184 to 190, lane-discipline apportionment, CCTV preservation inside the 14 to 28 day window, independent engineer instruction and like-for-like credit hire under Lagden v O'Connor. Personal-injury work referred to an SRA-regulated panel solicitor with the referral arrangement disclosed in writing. CityGrip Accident Claims (Citygrip LTD).
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