Who is presumed at fault in a UK rear-end shunt?

The following driver is presumed at fault. UK courts have applied a long-standing evidential presumption - sometimes shorthanded as the doctrine of res ipsa loquitur in the rear-end context - under which a driver who runs into the back of a vehicle ahead has, on the face of it, failed to keep a safe stopping distance under Highway Code rule 126. The leading vehicle's driver does not have to prove anything affirmatively to recover; the burden shifts to the following driver to rebut the presumption with evidence of brake-checking without good reason, defective brake lights on the leading vehicle, an emergency stop with no proximate cause, or a defect on the rear of the leading vehicle that materially contributed to the impact. Lord Denning's commentary on rear-end liability captures the principle that maintaining an adequate stopping distance is the following driver's duty.

What does Highway Code rule 126 actually say about stopping distance?

Rule 126 sets out the typical stopping distances at different speeds and the two-second rule for following another vehicle in good conditions. The shortest shorthand is to allow at least a two-second gap between your vehicle and the vehicle ahead on a dry road in good visibility. The rule expressly states that in wet weather the gap should be doubled, and on icy roads it should be increased by up to ten times. The published tables run from a 12-metre overall stopping distance at 20mph to a 96-metre overall stopping distance at 70mph. Rule 126 is an advisory rule - breach is not itself an offence - but it is admissible in any civil or criminal proceedings to establish liability under section 38(7) of the Road Traffic Act 1988.

Can the following driver ever avoid liability in a rear-end shunt?

Yes, but only on specific evidential grounds. The recognised carve-outs are: a sudden stop by the leading driver without good reason (brake-checking, sometimes pleaded as agent-provocateur conduct in road-rage incidents); defective or non-functioning brake lights on the leading vehicle that deprived the following driver of warning; a defect at the rear of the leading vehicle - unsecured overhang, debris falling from a load, an unlit projecting trailer - that materially contributed to the impact; and a genuine no-cause emergency stop where the leading driver braked for a non-existent hazard. Each carve-out must be supported by contemporaneous evidence - dashcam footage, photographs of the brake-light state after the collision, an engineer's report on the leading vehicle's condition or independent witness evidence.

What is the two-second rule and how does the courtroom apply it?

The two-second rule is the practical test embedded in Highway Code rule 126 for following distance in good conditions on dry roads. As the vehicle ahead passes a fixed marker the following driver should be able to recite the phrase 'only a fool breaks the two-second rule' before passing the same marker. In wet weather the gap should double to four seconds; on ice the gap should increase by up to ten times. The county courts treat compliance with the two-second rule as strong prima facie evidence that the following driver kept an adequate stopping distance; breach is strong evidence to the contrary. The rule is not a statute but it is the most commonly cited single yardstick in disputed rear-end pleadings.

Does mobile-phone use change the liability picture in a rear-end shunt?

Yes, materially. Holding and using a hand-held mobile phone while driving is an offence under section 41D of the Road Traffic Act 1988 and regulation 110 of the Road Vehicles (Construction and Use) Regulations 1986. The regulation was amended on 25 March 2022 to broaden the definition of 'interactive communication' so that any holding-and-using - taking photographs, scrolling music, unlocking the device - is caught, not only calls and texts. A following driver who rear-ends the vehicle ahead while holding a phone has effectively no rebuttal to the rear-end presumption: the breach of rule 126 is established and the criminal offence is admissible evidence of the standard of care.

How is liability split in a multi-car chain-reaction rear-end shunt?

The starting point in a three-or-more vehicle chain reaction is that the first impact starts the chain. Where vehicle C runs into the back of vehicle B and pushes B into the back of vehicle A, the prima facie position is that C bears the entire chain - C failed to keep a safe stopping distance behind B; B was a passive victim pushed forward by the kinetic energy of the C-B impact. The split changes where there were two distinct impacts: where B had already stopped after rear-ending A and C then ran into B as a separate event, C is liable for the B-C damage and B remains liable for the A-B damage. Engineer evidence on impact sequence, paint transfer and crumple-zone geometry is normally instructed early to settle the split.

Is my rear-end shunt claim eligible for the Official Injury Claim portal?

Most low-value whiplash rear-end claims are eligible. The Official Injury Claim portal at officialinjuryclaim.org.uk handles road-traffic injury claims valued under £5,000 in general damages for pain, suffering and loss of amenity, under the Civil Liability Act 2018 small-claims-track regime. The portal has been live since 31 May 2021. The Whiplash Injury (Amendment) Regulations 2025 - Statutory Instrument SI 2025/615 - uplifted the tariff bands for accidents occurring on or after 31 May 2025. Where the injury is more serious, where there is a vulnerability, where liability is contested on the contributory-negligence carve-outs or where general damages exceed the small-claims limit, the claim sits outside the portal and proceeds through an SRA-regulated solicitor.

What is the current whiplash tariff in 2026?

The current whiplash tariff is set by the Whiplash Injury (Amendment) Regulations 2025 (SI 2025/615) and applies to accidents on or after 31 May 2025. The tariff bands run from a few hundred pounds for soft-tissue injury of three months or less through to around four thousand pounds for the most serious whiplash band of fifteen to twenty-four months. A modest uplift is available where the injury significantly affects the claimant's ability to function during the symptomatic period. The tariff covers the pain-suffering-and-loss-of-amenity component only; financial losses - earnings, treatment costs, vehicle damage - are claimed separately and not capped by the tariff.

How long do I have to make a UK rear-end shunt claim?

Three years from the date of the accident for any personal injury claim under section 11 of the Limitation Act 1980; six years from the date of the accident for vehicle damage and other property loss under section 2 of the same Act. For children the three-year clock starts on the eighteenth birthday. For protected parties under the Mental Capacity Act 2005 the clock does not run while capacity is absent. Claims against the Motor Insurers' Bureau - where the at-fault driver was uninsured or untraced - have additional strict notification deadlines under the MIB Uninsured Drivers' Agreement 2015 and the Untraced Drivers' Agreement 2017. The relevant limitation date is recorded on every CityGrip file at intake.

Why do insurers usually admit liability quickly in a clean rear-end?

Rear-end shunts are short-tail claims. The rear-end presumption against the following driver is well established, the evidence at scene is usually clear (the cars are still where they came to rest, the damage pattern is unambiguous and dashcam footage from either party tends to settle the picture), and there is little scope for liability to drift over time. Insurers generally admit liability inside the first 21 days under the MoJ Pre-Action Protocol for Low Value Personal Injury Claims and move directly to quantum. Liability only complicates where the following driver pleads one of the contributory-negligence carve-outs - brake-checking, defective brake lights, defective rear of the leading vehicle, or a genuine no-cause emergency stop. The visible-evidence trail decides those arguments quickly.

What evidence should I preserve after a rear-end shunt?

Scene photographs of every vehicle's resting position before vehicles are moved, taken from at least three angles; close-ups of the damage pattern on both rear and front bumpers; close-ups of the leading vehicle's brake lights with the ignition on if possible, to rebut any later allegation that they were defective; the dashcam clip backed up to cloud storage within 24 hours before the camera loops; the names, addresses, registration marks and insurer details of every driver involved under section 170 of the Road Traffic Act 1988; the names and contact details of any witnesses who stopped; and the police incident or collision reference number where police attended. For a chain reaction, photograph the entire chain in sequence so the impact order is preserved.

Collision type - rear-end shunt

UK rear-end shunt claims for non-fault drivers and passengers

UK rear-end shunt accident management. Highway Code rule 126 stopping distance, the rear-end presumption against the following driver, contributory-negligence carve-outs (brake-checking, defective brake lights, defective rear-end condition, no-cause emergency stops), multi-car chain liability, whiplash tariff under the Whiplash Injury (Amendment) Regulations 2025 (SI 2025/615) and OIC portal eligibility for sub-£5,000 injury claims.

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Upfront to driver

What is a UK rear-end shunt claim?

A rear-end shunt is a UK road-traffic collision where the following driver runs into the back of a vehicle ahead. UK law applies a rear-end presumption against the following driver - the leading driver does not have to prove fault, the burden shifts to the following driver to rebut. The rebuttal turns on a small set of contributory-negligence carve-outs: brake-checking without good reason, defective brake lights on the leading vehicle, a defective rear-end condition or a genuine no-cause emergency stop. Most low-value whiplash claims run through the Official Injury Claim portal under the Civil Liability Act 2018 small-claims regime, with the tariff uplifted by SI 2025/615 for accidents on or after 31 May 2025. This page sets out the rule 126 stopping-distance frame, the carve-outs, the chain-reaction split mechanics and the universal six-step evidence flow.

Rear-end shunts are the highest-frequency at-scene collision pattern on UK roads. They are also the most evidentially clean - the cars come to rest where the impact ended, the damage pattern is unambiguous, the dashcam clip usually settles any liability dispute and the insurer for the following driver normally admits liability inside the first three weeks. The fault picture begins with Highway Code rule 126: every driver must allow at least a two-second following gap on a dry road in good visibility, double the gap in wet weather and up to ten times the gap on ice. A driver who runs into the back of a vehicle ahead has, on the face of it, failed that duty - and the burden of proof shifts to that driver to show why the rear-end presumption should not apply. For the universal plain-English claim flow that applies whichever side of a rear-end shunt you were on, see our how to claim after a car accident guide; for the underlying procedural map see our UK accident claim process overview.

Highway Code rule 126: the stopping-distance frame

The starting point for any UK rear-end shunt analysis is Highway Code rule 126. The rule sets out the typical stopping distances at different speeds and establishes the practical two-second rule for following distance in good conditions on a dry road. As the vehicle ahead passes a fixed marker the following driver should be able to recite the phrase "only a fool breaks the two-second rule" before passing the same marker. The published table runs from a 12-metre overall stopping distance at 20mph through 23 metres at 30mph, 36 metres at 40mph, 53 metres at 50mph, 73 metres at 60mph and 96 metres at 70mph in good conditions. Thinking distance and braking distance are added to give the overall figure; the thinking distance grows linearly with speed while the braking distance grows with the square of speed.

Rule 126 is an advisory rule rather than a MUST or MUST NOT requirement. Breach of rule 126 is not itself an offence - there is no separate construction-and-use regulation that puts a fixed-penalty notice on following too closely (the offence is captured by the broader careless or dangerous driving framework under sections 2 and 3 of the Road Traffic Act 1988). But rule 126 is admissible in any civil or criminal proceedings to establish liability under section 38(7) of the same Act. In practice the county courts treat compliance with the two-second rule as strong evidence that the following driver kept an adequate stopping distance; breach is strong evidence to the contrary. Rule 227 of the Highway Code reinforces the position in wet weather and at reduced visibility - stopping distances will be at least double those required for stopping on dry roads, and the two-second rule should be applied accordingly.

01REAR-END

The rear-end presumption and Lord Denning's commentary

The UK courts have applied a long-standing evidential presumption in rear-end shunts. Sometimes shorthanded as the doctrine of res ipsa loquitur - the thing speaks for itself - the presumption operates so that a driver who runs into the back of a vehicle ahead is taken to have failed to keep an adequate stopping distance. The leading driver does not have to prove fault affirmatively; the burden shifts to the following driver to rebut the presumption with positive evidence. Lord Denning's commentary on the principle in the rear-end context captures it cleanly: maintaining an adequate stopping distance is the following driver's duty, and the consequence of failing in that duty is that liability follows the rear vehicle.

The presumption is not absolute. The county courts will accept a rebuttal on a narrow set of grounds where the following driver can point to contemporaneous evidence. A leading driver who brake-checked without good reason has contributed to the impact and the damages will be reduced under the Law Reform (Contributory Negligence) Act 1945. A leading vehicle whose brake lights were defective at the time of the collision has deprived the following driver of warning. A leading vehicle with a defective rear-end condition - unsecured overhang, an unlit projecting trailer, falling load, debris - has materially contributed to the impact. A genuine no-cause emergency stop - braking hard for a hazard that did not exist - sits in the same carve-out. Where none of those facts are made out, the presumption holds and the following driver pays.

02REAR-END

Contributory-negligence carve-outs from the rear-end presumption

The Law Reform (Contributory Negligence) Act 1945 allows the court to reduce damages where the claimant's own conduct contributed to the injury or loss. In rear-end shunts the recognised carve-outs from the rear-end presumption are: a sudden stop by the leading driver without good reason (brake-checking, which in road-rage cases may carry a contributory deduction of 25 to 50 per cent or more); defective or non-functioning brake lights on the leading vehicle that deprived the following driver of the standard warning (typically a 25 per cent deduction, by analogy with the seatbelt deduction in Froom v Butcher); a defect on the rear of the leading vehicle that materially contributed to the impact - for example an unsecured projecting load, debris falling from the vehicle or an unlit trailer that increased the stopping distance required; and a no-cause emergency stop where the leading driver braked hard for a hazard that did not exist.

Each carve-out must be evidenced. A brake-check pleading runs on dashcam footage from the following vehicle, on any prior conduct between the two drivers in the moments before the shunt (a flash of headlights, a horn, tailgating disputes in the dashcam audio), and on any independent witness account. A defective-brake-light pleading runs on a photograph of the rear of the leading vehicle taken at the scene with the ignition on, or on the engineer's inspection report after the vehicle has been recovered. A defective-rear-end pleading runs on the scene photographs showing the protruding load, the unlit trailer or the debris field. A no-cause emergency-stop pleading runs on the absence of any hazard visible in the dashcam clip, in the road position and in the witness evidence. Without the evidence the carve-out fails and the presumption holds.

Common UK stopping-distance failures: tailgating, phone use, wet, ice and low sun

The rear-end shunts that present at intake cluster around a small set of stopping-distance failures. Tailgating - deliberately or carelessly closing the two-second gap to fewer than half its required length - is the single most common pattern. It is the recognised offence basis under the careless-driving framework in section 3 of the Road Traffic Act 1988 and is enforced through dedicated tailgating-detection cameras on the strategic road network operated by National Highways and the police. Distracted driving is the second most common pattern. Holding and using a hand-held mobile phone while driving is an offence under section 41D of the Road Traffic Act 1988 read with regulation 110 of the Construction and Use Regulations 1986; the regulation was amended on 25 March 2022 to broaden the definition of interactive communication so that holding and using a device for any reason - taking photographs, scrolling music, unlocking the handset - is caught.

Weather and surface conditions account for the third major pattern. Wet roads double the stopping distance required under rule 126 and rule 227. Icy roads multiply the stopping distance by up to ten times. A following driver who maintained a perfectly adequate gap for dry conditions has failed the duty under rule 126 if the road was wet or icy. The Met Office severe-weather warning record is admissible in disputed-liability rear-end pleadings as an objective record of conditions. Low-sun glare is the fourth recurring failure mode. The standard finding is that a driver who could not see the brake lights of the vehicle ahead because of low sun should have reduced speed and increased the gap accordingly; the low-sun-glare defence rarely succeeds against the rear-end presumption on its own. Leaf-fall season on tree-lined rural A-roads and white-line wear in lane markings round out the surface-condition list.

REAR-END

Section 3 of the walkthrough.

The rear-end damage pattern: bumper crumple, engine-bay push-through, whiplash and SRS deployment

Rear-end shunts produce a characteristic damage pattern that the engineer evidence on the file picks up cleanly. The leading vehicle takes rear-bumper crumple - the reinforced rear bar absorbs the first impact and deforms rearwards, the boot floor folds and the rear panels distort. At higher energies the rear impact pushes through into the rear suspension mounting points and, in saloons and hatchbacks, into the rear bulkhead. The following vehicle takes corresponding front-bumper damage, with the radiator pack and condenser commonly displaced rearwards in moderate impacts and the engine bay pushing through to the bulkhead in higher-energy events. Where the rear impact was severe enough to push the leading vehicle into another vehicle ahead, the leading vehicle takes a second impact at the front and the damage pattern reads as a sandwich deformation across both bumpers.

The occupant-injury pattern follows the kinetic geometry. Whiplash - clinically cervical-acceleration-deceleration injury - is the signature injury of the leading vehicle's occupants. The sudden forward jolt of the torso restrained by the seatbelt with the head free to whip forward and back stresses the cervical spine and the soft tissues of the neck and the upper thoracic region. Symptoms commonly include neck pain, stiffness, headaches, reduced range of motion, shoulder pain and in some cases referred arm pain. Supplementary restraint system (SRS) deployment - front airbags, knee airbags, seatbelt pretensioners - is more common in the following vehicle in higher-energy front-impact rear-ends and brings its own pattern of contusion, abrasion and minor burn injuries from the airbag propellant. In a chain reaction with multiple impacts the leading vehicle's occupants may suffer both rearward and forward acceleration injuries in rapid succession.

04REAR-END

Multi-car chain reactions: how liability splits across three or more vehicles

Chain-reaction rear-end shunts are the second-commonest pattern after two-car rear-ends. The starting point is that the first impact starts the chain. Where vehicle C runs into the back of vehicle B and pushes B into the back of vehicle A as part of a single kinetic-energy event, the prima facie position is that C bears the entire chain. C failed to keep a safe stopping distance behind B; B was a passive victim, pushed forward by the energy of the C-B impact, and B's involvement in the A-B contact was the direct mechanical consequence of C's breach. Both A and B recover from C's insurer.

The split changes where there were two distinct impacts separated in time. Where B had already stopped after rear-ending A and was stationary for long enough to constitute a separate event when C then ran into B, C is liable for the B-C damage and B remains liable for the A-B damage. Three practical tests decide which scenario applies: the dashcam clip from any vehicle in the chain, the engineering evidence on impact geometry and paint transfer, and the police witness statements from any officer who attended. Pile-ups of five or more vehicles in fog or sudden braking on motorways introduce a third layer - where multiple distinct kinetic events occur in rapid succession the apportionment can run across three, four or more separate insurers. CityGrip instructs an independent engineer in every chain-reaction file inside the first 14 days so the impact sequence is settled on neutral ground before the third-party insurers' engineers reach divergent conclusions.

05REAR-END

Insurance dynamics in a UK rear-end shunt: short-tail claim handling

Rear-end shunts are short-tail claims. The rear-end presumption is well established, the at-scene evidence is normally clear and the major UK motor insurers - Aviva, AXA, Allianz, Direct Line, Admiral, Hastings, LV=, RSA, Esure, Churchill, More Than, Saga - admit liability quickly in a clean rear-end. The Pre-Action Protocol for Low Value Personal Injury Claims in Road Traffic Accidents (the MoJ portal protocol) and the Official Injury Claim portal frame the early admission of liability inside the first 21 days where the property-damage and injury claims fall inside the relevant thresholds. Liability is normally admitted, an interim payment may be offered on the property-damage side and the file moves to quantum.

The claim only complicates where the following driver's insurer pleads one of the contributory-negligence carve-outs. A brake-check allegation against a leading-vehicle claimant is rare but, when made, materially changes the file - the leading claimant may face a 25 to 50 per cent contributory-negligence deduction, or in extreme road-rage cases a complete denial. A defective-brake-light allegation typically runs at a 25 per cent deduction. A defective-rear-end allegation runs on the specific defect and the proportion of the stopping distance shortfall it explains. The presence or absence of dashcam footage decides the dispute in the great majority of cases. Where the at-fault driver was uninsured or untraced the file moves to the Motor Insurers' Bureau under the Uninsured Drivers' Agreement 2017 or the Untraced Drivers' Agreement 2017; the rear-end presumption still applies but the procedural rules are stricter.

Where the rear-end driver was uninsured or could not be traced, the file routes through the MIB rather than a direct insurer claim - see our dedicated guides to a MIB uninsured driver claim and a MIB untraced driver claim for the strict notification deadlines under the 2017 agreements. The ordinary three-year limitation period for personal injury under the Limitation Act 1980 still applies in either case.

OIC portal eligibility and the 2025 whiplash tariff (SI 2025/615)

Most low-value whiplash rear-end claims run through the Official Injury Claim portal at officialinjuryclaim.org.uk. The portal has been live since 31 May 2021 under the Civil Liability Act 2018 small-claims regime and handles road-traffic injury claims valued under £5,000 in general damages for pain, suffering and loss of amenity. The claimant completes the form, the claim is sent to the at-fault driver's insurer, a medical report is obtained from a MedCo-accredited reporter and the tariff calculation follows. The portal is designed for use without a legal representative, although panel solicitors do appear on a no-win-no-fee basis for portal claims that prove more complex than expected.

The whiplash tariff that applies in 2026 is the revised tariff under the Whiplash Injury (Amendment) Regulations 2025 (SI 2025/615) for accidents on or after 31 May 2025. The bands run from a few hundred pounds for soft-tissue injury of three months or less through to around four thousand pounds for the most serious band of fifteen to twenty-four months. The full duration-banded figures and the OIC route are set out on our whiplash compensation tariff guide. A modest uplift is available where the injury significantly affects the claimant's ability to function during the symptomatic period. The tariff covers the pain-suffering-and-loss-of-amenity component only - financial losses (earnings, treatment costs, vehicle damage, credit hire) are claimed separately on the property-damage side and are not capped by the tariff. Where the injury is more serious, where there is a vulnerability, where liability is contested on the contributory-negligence carve-outs or where general damages exceed the £5,000 small-claims limit, the claim sits outside the portal and proceeds through an SRA-regulated solicitor on the standard litigation route - our page on a personal injury claim after a car accident covers the wider quantum picture, and the three-year limitation period applies whichever route the file takes.

This rear-end shunt page sits below the collision-types hub and alongside the other at-scene scenario pages. The parent hub covers the universal evidence flow; the lateral pages cover the adjacent at-scene patterns where the same statutory frame applies but the rules engaged shift.

Parent and top-level hubs:

Collision types (UK hub) →
Master hub for 24 UK collision scenarios - the parent page to this rear-end shunt sub-page.
Car accident claims (UK hub) →
Top-level UK car accident claim hub covering the entire non-fault driver workflow.
Non-fault car accident claims →
End-to-end non-fault claim coordination - recovery, storage, engineer, credit hire and repair.

Lateral collision-type pages:

Roundabout accident claims →
Mini, normal and signalised roundabout collisions under Highway Code rules 184-190.
Junction accident claims →
T-junction, crossroad and signal-controlled junction collisions, including rule H2 pedestrian priority.
Lane change accident claims →
Side-swipe and merge collisions on dual carriageways and motorways under Highway Code rule 159.
Minicab and PHV accident claims →
Where the rear-end shunt involved a private hire vehicle as the leading or following vehicle.

Ranking factors

Six UK rear-end shunt claim-strength factors

The six factors that distinguish a strong UK rear-end shunt claim from a weak one. The rear-end presumption tilts the starting point heavily in the leading driver's favour, but the file still has to be built - and a poorly evidenced rear-end can still lose on a carve-out. CityGrip handles each on a claim-by-claim basis.

Immediate action in the first 72 hours

Rear-end shunts settle fastest where the impact-sequence record is locked down inside the first three days. Dashcam clips backed up before the camera loops, photographs of every vehicle's resting position before anything moves, brake-light state captured with the ignition on, witness contact details and the section 170 exchange completed on scene. Files opened inside 72 hours admit liability quicker and at higher percentages than files opened weeks later.

Window: 0-72 hours

UK process fit - Highway Code rule 126 and statute

A rear-end shunt file with the right statutory citations on day one moves cleanly: Highway Code rule 126 stopping distance, RTA 1988 section 170 exchange duty, the Civil Liability Act 2018 with SI 2025/615 tariff for whiplash, the Limitation Act 1980 section 11 three-year clock, and where mobile-phone use is in play, RTA 1988 section 41D and regulation 110 of the Construction and Use Regulations 1986. Generic narrative files do not.

Authority: legislation.gov.uk + gov.uk

Evidence window for third-party records

Dashcam clips loop inside 24 to 48 hours. National Highways gantry CCTV on motorways and the smart-motorway network retains for around 14 days. Bus-mounted CCTV varies by operator. Shop-front and forecourt CCTV typically holds for 28 days at most. Preservation letters must be sent inside the retention window or the only neutral record of the impact sequence in a multi-car chain is gone for good.

Window: 14-28 days for CCTV

Compliance boundary - CMC scope versus solicitor

Accident management - recovery, storage, credit hire, independent engineer, repair coordination, third-party insurer dialogue - sits inside the FCA Claims Management Conduct of Business sourcebook (CMCOB) scope. The personal-injury work for a whiplash claim outside the OIC portal small-claims limit is referred to an SRA-regulated solicitor under CMCOB 6 and CMCOB 7 with the referral arrangement disclosed in writing. CMCOB 4.3.1R(1A) standalone disclosure makes the customer's choice visible before any instruction.

Reference: FCA CMCOB 4, 6 and 7

Operational detail - rear-end carve-outs and chain mechanics

Rear-end files do not all run the same way. A clean rear-end on a dry road settles on the presumption. A brake-check pleading runs on the dashcam clip and the leading driver's prior conduct. A defective-brake-light defence runs on the scene photograph captured with the ignition on. A multi-car chain runs on impact-sequence engineering - paint transfer, crumple geometry and the order of contact. CityGrip records each particular at intake so the right evidence chain runs from day one.

Method: claim-by-claim, not template

Reviewed entity - who handles what

CityGrip Accident Claims (Citygrip LTD) is the accident management entity. Independent engineers, PAS 43 recovery operators, BS 10125-certified repairers 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 under CMCOB 6.1. Reviewed entities are real, named UK businesses - not placeholders.

Disclosure: SRA + FCA + ABI panels

Six-step UK rear-end shunt post-collision evidence flow

The same six steps apply to every UK rear-end shunt, from a two-car low-speed urban shunt to a five-car fog pile-up on a smart motorway. Step one secures the scene; step six opens the accident management file with the independent engineer instructed. Speak to a CityGrip handler at any point in the flow.

Step 1
Make the scene safe and check for injury
Stop, switch on hazard warning lights, check yourself and your passengers for cervical-acceleration-deceleration (whiplash) symptoms and check the occupants of every other vehicle in the chain. Where the carriageway is live, do not exit on a motorway lane or smart-motorway running lane - National Highways protocol requires occupants to remain in the vehicle with seatbelts on where it is too dangerous to leave. Where the road can be cleared safely, move vehicles to the verge or the nearest safe lay-by. Call 999 where any person is injured, where a chain reaction has blocked the carriageway or where another vehicle's load has spilled.
Step 2
Photograph the chain in sequence before vehicles are moved
Rear-end shunts are won and lost on the impact-sequence record. Photograph every vehicle's final resting position from at least three angles before anything is moved. Photograph the registration plates and the damage pattern on each rear bumper and each front bumper in the chain. Photograph the leading vehicle's brake lights with the ignition on where it is safe to do so - this rebuts any later allegation that they were defective. Photograph any debris field, road surface (wet, dry, ice, leaf-fall, low sun) and any traffic signal or sign visible at the scene.
Step 3
Exchange details under Road Traffic Act 1988 section 170
Every driver in the chain must give name, address, vehicle registration mark and the name and address of the insurer to every other driver and to any person reasonably requiring them. In a three-or-more vehicle chain, exchange the full set with every other driver - not only the driver immediately ahead or behind. Where any driver refuses to exchange details, or where any person was injured, the collision must be reported to the police as soon as reasonably practicable and in any event within 24 hours under section 170(6) of the Road Traffic Act 1988.
Step 4
Back up the dashcam clip within 24 hours
Most dashcams overwrite on a 24- to 48-hour loop. Pull the SD card or use the camera's wireless backup function to copy the entire clip - at least 30 seconds before impact and 60 seconds after - to cloud storage and to a second physical device within 24 hours. Save the file with date, time, location and a one-line description. Where the chain reaction had multiple impacts, the dashcam clip is usually the only evidence that establishes the impact sequence reliably. The same applies to a passenger's mobile phone video, a fleet telematics record or a CCTV clip from a roadside or shop-front camera in the line of sight.
Step 5
Notify your own insurer and consider the at-fault insurer route
Notify your own insurer of the collision for information purposes inside the policy deadline (typically seven days under most schedules) regardless of fault - notification does not commit you to claiming against your own policy. Where you are non-fault, the cleaner route is to claim through the at-fault driver's insurer directly. This preserves your no-claims discount, avoids your policy excess and unlocks like-for-like credit hire under Lagden v O'Connor [2003] UKHL 64. Where the at-fault driver is uninsured or untraced, the claim runs against the Motor Insurers' Bureau under the Uninsured Drivers' Agreement 2015 or the Untraced Drivers' Agreement 2017.
Step 6
Open the accident management file and instruct an independent engineer
Open a file with an accident management company at the earliest opportunity. Recovery from the scene to a secure PAS 43 storage site, an independent engineer's report under the ABI Salvage Code (Cat A, B, S or N), like-for-like credit hire instruction and repair coordination at a BS 10125-certified bodyshop all start from the same call. For an injury that exceeds the £5,000 OIC small-claims threshold the file is referred to an SRA-regulated solicitor with the referral arrangement disclosed in writing under CMCOB 6 and CMCOB 7. The standalone CMCOB 4.3.1R(1A) disclosure - you are not obliged to use a claims management company - is given to you in writing before any instruction.

UK rear-end shunt claims - FAQs

Who is presumed at fault in a UK rear-end shunt?: The following driver is presumed at fault. UK courts have applied a long-standing evidential presumption - sometimes shorthanded as the doctrine of res ipsa loquitur in the rear-end context - under which a driver who runs into the back of a vehicle ahead has, on the face of it, failed to keep a safe stopping distance under Highway Code rule 126. The leading vehicle's driver does not have to prove anything affirmatively to recover; the burden shifts to the following driver to rebut the presumption with evidence of brake-checking without good reason, defective brake lights on the leading vehicle, an emergency stop with no proximate cause, or a defect on the rear of the leading vehicle that materially contributed to the impact. Lord Denning's commentary on rear-end liability captures the principle that maintaining an adequate stopping distance is the following driver's duty.
What does Highway Code rule 126 actually say about stopping distance?: Rule 126 sets out the typical stopping distances at different speeds and the two-second rule for following another vehicle in good conditions. The shortest shorthand is to allow at least a two-second gap between your vehicle and the vehicle ahead on a dry road in good visibility. The rule expressly states that in wet weather the gap should be doubled, and on icy roads it should be increased by up to ten times. The published tables run from a 12-metre overall stopping distance at 20mph to a 96-metre overall stopping distance at 70mph. Rule 126 is an advisory rule - breach is not itself an offence - but it is admissible in any civil or criminal proceedings to establish liability under section 38(7) of the Road Traffic Act 1988.
Can the following driver ever avoid liability in a rear-end shunt?: Yes, but only on specific evidential grounds. The recognised carve-outs are: a sudden stop by the leading driver without good reason (brake-checking, sometimes pleaded as agent-provocateur conduct in road-rage incidents); defective or non-functioning brake lights on the leading vehicle that deprived the following driver of warning; a defect at the rear of the leading vehicle - unsecured overhang, debris falling from a load, an unlit projecting trailer - that materially contributed to the impact; and a genuine no-cause emergency stop where the leading driver braked for a non-existent hazard. Each carve-out must be supported by contemporaneous evidence - dashcam footage, photographs of the brake-light state after the collision, an engineer's report on the leading vehicle's condition or independent witness evidence.
What is the two-second rule and how does the courtroom apply it?: The two-second rule is the practical test embedded in Highway Code rule 126 for following distance in good conditions on dry roads. As the vehicle ahead passes a fixed marker the following driver should be able to recite the phrase 'only a fool breaks the two-second rule' before passing the same marker. In wet weather the gap should double to four seconds; on ice the gap should increase by up to ten times. The county courts treat compliance with the two-second rule as strong prima facie evidence that the following driver kept an adequate stopping distance; breach is strong evidence to the contrary. The rule is not a statute but it is the most commonly cited single yardstick in disputed rear-end pleadings.
Does mobile-phone use change the liability picture in a rear-end shunt?: Yes, materially. Holding and using a hand-held mobile phone while driving is an offence under section 41D of the Road Traffic Act 1988 and regulation 110 of the Road Vehicles (Construction and Use) Regulations 1986. The regulation was amended on 25 March 2022 to broaden the definition of 'interactive communication' so that any holding-and-using - taking photographs, scrolling music, unlocking the device - is caught, not only calls and texts. A following driver who rear-ends the vehicle ahead while holding a phone has effectively no rebuttal to the rear-end presumption: the breach of rule 126 is established and the criminal offence is admissible evidence of the standard of care.
How is liability split in a multi-car chain-reaction rear-end shunt?: The starting point in a three-or-more vehicle chain reaction is that the first impact starts the chain. Where vehicle C runs into the back of vehicle B and pushes B into the back of vehicle A, the prima facie position is that C bears the entire chain - C failed to keep a safe stopping distance behind B; B was a passive victim pushed forward by the kinetic energy of the C-B impact. The split changes where there were two distinct impacts: where B had already stopped after rear-ending A and C then ran into B as a separate event, C is liable for the B-C damage and B remains liable for the A-B damage. Engineer evidence on impact sequence, paint transfer and crumple-zone geometry is normally instructed early to settle the split.
What injuries are typical in a UK rear-end shunt?: Whiplash - clinically cervical-acceleration-deceleration injury - is the signature injury. The sudden forward jolt of the torso restrained by the seatbelt with the head free to whip forward and back stresses the cervical spine, the soft tissues of the neck and the upper thoracic region. Symptoms commonly include neck pain, stiffness, headaches, reduced range of motion, shoulder and upper back pain and in some cases referred arm pain. Supplementary restraint deployment (front airbags, knee airbags, seatbelt pretensioners) is common in higher-energy rear impacts and brings its own pattern of contusion, abrasion and minor burn injuries. Where the rear impact was severe enough to push the leading vehicle into another vehicle ahead, the leading vehicle's occupants may suffer both rearward and forward acceleration injuries in rapid succession.
Is my rear-end shunt claim eligible for the Official Injury Claim portal?: Most low-value whiplash rear-end claims are eligible. The Official Injury Claim portal at officialinjuryclaim.org.uk handles road-traffic injury claims valued under £5,000 in general damages for pain, suffering and loss of amenity, under the Civil Liability Act 2018 small-claims-track regime. The portal has been live since 31 May 2021. The Whiplash Injury (Amendment) Regulations 2025 - Statutory Instrument SI 2025/615 - uplifted the tariff bands for accidents occurring on or after 31 May 2025. Where the injury is more serious, where there is a vulnerability, where liability is contested on the contributory-negligence carve-outs or where general damages exceed the small-claims limit, the claim sits outside the portal and proceeds through an SRA-regulated solicitor.
What is the current whiplash tariff in 2026?: The current whiplash tariff is set by the Whiplash Injury (Amendment) Regulations 2025 (SI 2025/615) and applies to accidents on or after 31 May 2025. The tariff bands run from a few hundred pounds for soft-tissue injury of three months or less through to around four thousand pounds for the most serious whiplash band of fifteen to twenty-four months. A modest uplift is available where the injury significantly affects the claimant's ability to function during the symptomatic period. The tariff covers the pain-suffering-and-loss-of-amenity component only; financial losses - earnings, treatment costs, vehicle damage - are claimed separately and not capped by the tariff.
How long do I have to make a UK rear-end shunt claim?: Three years from the date of the accident for any personal injury claim under section 11 of the Limitation Act 1980; six years from the date of the accident for vehicle damage and other property loss under section 2 of the same Act. For children the three-year clock starts on the eighteenth birthday. For protected parties under the Mental Capacity Act 2005 the clock does not run while capacity is absent. Claims against the Motor Insurers' Bureau - where the at-fault driver was uninsured or untraced - have additional strict notification deadlines under the MIB Uninsured Drivers' Agreement 2015 and the Untraced Drivers' Agreement 2017. The relevant limitation date is recorded on every CityGrip file at intake.
Why do insurers usually admit liability quickly in a clean rear-end?: Rear-end shunts are short-tail claims. The rear-end presumption against the following driver is well established, the evidence at scene is usually clear (the cars are still where they came to rest, the damage pattern is unambiguous and dashcam footage from either party tends to settle the picture), and there is little scope for liability to drift over time. Insurers generally admit liability inside the first 21 days under the MoJ Pre-Action Protocol for Low Value Personal Injury Claims and move directly to quantum. Liability only complicates where the following driver pleads one of the contributory-negligence carve-outs - brake-checking, defective brake lights, defective rear of the leading vehicle, or a genuine no-cause emergency stop. The visible-evidence trail decides those arguments quickly.
What evidence should I preserve after a rear-end shunt?: Scene photographs of every vehicle's resting position before vehicles are moved, taken from at least three angles; close-ups of the damage pattern on both rear and front bumpers; close-ups of the leading vehicle's brake lights with the ignition on if possible, to rebut any later allegation that they were defective; the dashcam clip backed up to cloud storage within 24 hours before the camera loops; the names, addresses, registration marks and insurer details of every driver involved under section 170 of the Road Traffic Act 1988; the names and contact details of any witnesses who stopped; and the police incident or collision reference number where police attended. For a chain reaction, photograph the entire chain in sequence so the impact order is preserved.

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