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Glossary
The A-Z of UK motor accident claims
Plain-English definitions of the terms, schemes and statutes that come up in non-fault car accident claims across the United Kingdom.
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This glossary explains the language a non-fault driver encounters during a UK motor accident claim - from emission zones and tolls to the statutes and portals that govern the process. Definitions are written for the public, not for lawyers, and cross-link to the relevant guides and services on the site.
ULEZ
The Ultra Low Emission Zone (ULEZ) is Transport for London's emission-charging scheme. Since 29 August 2023 it covers every London borough up to (but not including) the M25, making it one of the largest urban emission zones in the world. Drivers of vehicles that do not meet the minimum emission standards - broadly Euro 4 for petrol cars and Euro 6 for diesels - pay a daily charge of £12.50 every time the vehicle is driven inside the zone, 24 hours a day, 365 days a year.
ULEZ matters in non-fault accident claims because a like-for-like replacement vehicle should leave the driver in the same position they were in before the collision. If the damaged car was ULEZ-compliant, the replacement should be compliant too; the driver should not be forced to pay £12.50 a day because of an accident that was not their fault. Where the original vehicle was non-compliant, ULEZ savings on the replacement are normally treated as offsetting the hire rate.
Clean Air Zone (CAZ)
A Clean Air Zone (CAZ) is a city-specific emission-charging scheme introduced under the UK Government's national framework, used by local authorities outside London to improve urban air quality. Each zone sets its own rules, charging hours and exempt vehicle categories. Birmingham operates a Class D CAZ charging non-compliant cars, vans, taxis, buses, coaches and HGVs. Bristol, Bath, Bradford, Tyneside (Newcastle and Gateshead), Sheffield and Portsmouth all operate their own variants, and other authorities are consulting on schemes.
Compliance is broadly Euro 6 for diesels and Euro 4 for petrol, but the detail differs by city: Bath, for example, exempts private cars, while Birmingham does not. In a non-fault claim, the right replacement vehicle depends on which CAZ the driver normally uses. A Birmingham resident with a compliant van needs a compliant van back. A driver who never enters a charging zone is not entitled to insist on a compliant upgrade.
Congestion Charge
The Congestion Charge is Transport for London's daily fee for driving inside the central London Congestion Charge zone. It currently applies between 07:00 and 18:00 Monday to Friday, and 12:00 to 18:00 on weekends and bank holidays (excluding 25 December to 1 January). The standard charge is paid in advance or by midnight on the third day after travel; failure to pay attracts a Penalty Charge Notice.
The Congestion Charge sits on top of ULEZ - a non-compliant vehicle entering the central zone during charging hours pays both. For non-fault claimants, the question is whether the regular use of the damaged vehicle involved crossing into the central zone. Private hire drivers with West End fares, tradespeople with Holborn or Aldgate jobs, and central-London residents may all need a replacement suited to that pattern of use. The recoverable cost of the Congestion Charge on a replacement vehicle is route-dependent and must be proportionate.
Credit hire
Credit hire is the established UK mechanism for putting a non-fault driver back on the road while their own vehicle is repaired or replaced after a collision. A specialist credit hire company supplies a like-for-like replacement vehicle on credit terms - the driver does not pay up front - and the cost is later recovered from the at-fault driver's insurer. The legal foundation runs from Giles v Thompson [1994] 1 AC 142 through Dimond v Lovell [2002] 1 AC 384 and Lagden v O'Connor [2003] UKHL 64.
Eligibility is not automatic. The claimant must have a genuine need for the replacement (no comparable alternative in the household), must mitigate their loss (no luxury upgrade), and must be able to demonstrate impecuniosity if they want to recover the full credit hire rate rather than the lower 'basic hire rate'. Hire periods must be reasonable and tied to actual repair or total-loss timelines. Reputable accident management companies screen these criteria before placing a hire.
Like-for-like replacement
A like-for-like replacement vehicle is one that is reasonably equivalent to the non-fault driver's damaged or written-off vehicle in size, body type, drivetrain, equipment level and intended use. The principle is that the claimant should be put back in the position they were in before the collision, no better and no worse. A 7-seat MPV used for school runs warrants another 7-seat MPV; a sign-written tradesman's van with internal racking warrants a comparable van.
Like-for-like is decided by reference to the original vehicle's role, not by reference to what is cheapest for the at-fault insurer to provide. Where the original vehicle was emission-compliant for the driver's regular routes (ULEZ, a CAZ, or both), the replacement must also be compliant. Where the original vehicle had specific load capacity, towing capability, accessibility adaptations or business signage, the replacement must match. Disputes about specification are common and are best resolved with a clear written record of the original vehicle's use.
Motor Insurers' Bureau (MIB)
The Motor Insurers' Bureau (MIB) is the UK statutory compensator of last resort for victims of uninsured and untraced drivers. It is funded by a levy on motor insurers and operates under two principal agreements with the Department for Transport: the Uninsured Drivers' Agreement (for collisions where the at-fault driver is identified but has no valid insurance) and the Untraced Drivers' Agreement (for hit-and-run and otherwise unidentified at-fault drivers).
MIB claims have strict procedural rules. Untraced cases require the collision to be reported to the police within five days for personal injury, and within 14 days for property damage; the reporting window is one of the most common reasons claims fail. Property damage claims under the Untraced Agreement carry a £400 excess and have a £750 minimum threshold. The MIB sits outside the normal third-party-insurer process and its decisions can be reviewed through internal arbitration. Specialist support is sensible because the procedural traps are unforgiving.
Non-fault accident
A non-fault accident is a road traffic collision in which the claimant driver is not legally responsible for what happened. Liability sits with another driver - typically because they failed to keep a proper lookout, drove without due care, breached the Highway Code, or breached a specific Road Traffic Act duty. Once liability is accepted or established, the at-fault driver's insurer is responsible for the claimant's recoverable losses, including vehicle damage, hire charges, recovery, storage, engineer's fees and out-of-pocket expenses.
Being non-fault is a legal conclusion, not a feeling. It depends on evidence: dashcam footage, photographs of vehicle positions and damage, independent witness details, police reference numbers and any statements at the scene. Admissions of fault at the scene are unwise - they prejudice the evidence, not just the conversation. Insurer 'split liability' decisions are common and can be contested where the evidence supports a clean non-fault finding. Specialist accident management focuses on preserving the evidence that makes the non-fault case stick.
PAS 125
PAS 125 is the British Standards Institution's Publicly Available Specification for the vehicle body repair industry. It sets out the minimum quality requirements for a body repair business: workshop equipment, technician qualifications, repair processes, paint and finishing standards, calibration of ADAS sensors, and traceable documentation of every repair stage. Bodyshops are audited against PAS 125 by an accredited certification body, and accreditation must be renewed periodically.
From a non-fault claimant's perspective, PAS 125 is a useful shorthand for 'competent repairer'. The standard does not guarantee any specific outcome on any specific car, but it does mean the workshop has demonstrated systems, equipment and staff competency to a recognised national benchmark. Many insurer-approved networks require PAS 125 as a minimum, and a non-fault claimant is entitled to choose a PAS 125 accredited repairer of their own preference rather than accept an insurer-directed alternative. The repair file should always evidence the standard followed.
Engineer inspection
An engineer inspection is the independent assessment of an accident-damaged vehicle by a qualified motor engineer, usually a member of the Institute of Automotive Engineer Assessors. The engineer establishes the repair scope (what work is needed to return the vehicle to pre-accident condition), the repair cost, and - where damage is serious - whether the vehicle is a total loss and what its pre-accident market value was. The report is the technical backbone of every non-fault property damage claim.
Timing matters. The inspection should happen before any repairs begin, because once parts are replaced or panels rectified the evidence of the damage is gone. Repairing a car before the engineer has documented the loss is one of the most damaging mistakes a non-fault claimant can make: it gives the at-fault insurer grounds to dispute scope, cost and even causation. A properly produced engineer report sets the insurer's first reserve and shortens negotiation considerably.
OIC portal
The Official Injury Claim (OIC) portal is the regulated online route for low-value road traffic accident personal injury claims in England and Wales. It was introduced on 31 May 2021 by the Ministry of Justice as part of the whiplash reform programme. The portal handles claims where the injury element is valued at £5,000 or less and total damages are below £10,000. Most soft-tissue neck and back injuries from rear-end collisions fall inside this band.
Inside the portal, whiplash injuries are compensated against a fixed tariff set by the Civil Liability Act 2018, with separate provision for mixed injuries and any vehicle damage element. Legal representation is not required, but the rules - including medical evidence requirements, tariff application and the limitation deadline - are detailed enough that many claimants prefer to use a solicitor. Claims above the threshold, claims involving children, and claims with complex injuries are handled outside the portal under standard Civil Procedure Rules.
Road Traffic Act 1988
The Road Traffic Act 1988 is the principal UK statute governing road traffic offences and the duties of drivers on the public highway. It consolidated earlier road traffic legislation and remains the framework most often cited in accident reporting and prosecution. Key provisions for collision claimants are sections 170 to 172. Section 170 imposes the duty to stop after an accident involving personal injury or damage to another vehicle, property or specified animals, to give particulars at the scene, and to report to the police within 24 hours where particulars cannot be exchanged.
Section 171 deals with the production of insurance details. Section 172 requires the registered keeper to identify the driver of a vehicle on request from the police. Breach of section 170 is a criminal offence and is treated seriously by the courts and by insurers. Compulsory motor insurance is mandated by section 143. In non-fault claims, a section 170 breach by the at-fault driver is often strong corroborating evidence of liability and supports a Motor Insurers' Bureau claim where the driver is untraced.
Limitation Act 1980
The Limitation Act 1980 is the UK statute that sets time limits for bringing civil claims in the courts of England and Wales. For motor accident claimants the two limits that matter most are in section 11 and section 2. Section 11 sets a three-year limitation period for personal injury claims, running from the date of the accident or the date the claimant first had knowledge of a significant injury attributable to it. Section 2 sets a six-year limitation period for claims in tort that do not involve personal injury - covering vehicle damage, hire charges and other property losses.
Different rules apply to children and to claimants without legal capacity, where time does not run until majority or capacity is restored. Missing the limitation deadline normally bars the claim entirely, regardless of how strong it is on the merits. The Limitation Act is the reason claims should not be left to drift - gathering evidence is easier in the first weeks, and starting court proceedings (or settling) inside the statutory window is a hard requirement, not a guideline.
Civil Liability Act 2018
The Civil Liability Act 2018 is the UK statute that reshaped the way low-value whiplash claims are compensated. It introduced a fixed tariff of damages for whiplash injuries of up to two years' duration, payable to drivers and passengers of cars and other light vehicles involved in road traffic accidents in England and Wales. The Act also paved the way for the small-claims track limit for road traffic personal injury to be increased to £5,000, which in turn created the operational space for the Official Injury Claim (OIC) portal.
In practice, the Act standardised compensation for the bulk of soft-tissue neck and back injuries and reduced the role of bespoke judicial assessment in that band. It did not affect claims above the threshold, claims by vulnerable road users, or non-injury heads of loss such as vehicle damage, recovery and credit hire. The Act sits alongside the Road Traffic Act 1988 and the Limitation Act 1980 as one of the three statutes a non-fault claimant most often encounters.
Dart Charge
Dart Charge is the toll for using the Dartford-Thurrock river crossing on the M25 between Kent and Essex. The crossing comprises the Dartford Tunnel northbound and the Queen Elizabeth II Bridge southbound. The toll applies in both directions and is charged daily between 06:00 and 22:00. Payment is made online, by phone, or through an automated PrePay account; cash booths were withdrawn in 2014 and the crossing now operates entirely on ANPR.
Failure to pay by midnight on the day after the crossing triggers a Penalty Charge Notice. For non-fault accident claimants whose normal routes use the crossing - and there are many in east London, Essex and north Kent - the recoverable cost of Dart Charge on a replacement vehicle should be put on the claim. The point is the same as with ULEZ and the Congestion Charge: a like-for-like replacement should leave the claimant in the same operational position, with the same effective access to the road network, as before the collision.
Silvertown Tunnel toll
The Silvertown Tunnel toll is the user charge for the twin-bore road tunnel under the Thames between Greenwich Peninsula (SE10) and Silvertown (E16). The tunnel opened in 2025 and was funded on the basis that both it and the adjacent Blackwall Tunnel would be tolled together, so the charge applies to drivers using either crossing. Pricing is time-of-day variable, with peak and off-peak bands, and is paid by automated number plate recognition through the same Transport for London system used for Dart Charge and ULEZ.
For non-fault claimants in east and south-east London, the Silvertown toll has become a routine line item. Drivers who regularly cross the river through Blackwall or Silvertown - private hire drivers, tradespeople, residents commuting across the Thames - are entitled to a replacement vehicle that can make the same crossings, and the recoverable hire-period toll cost should be evidenced and presented to the at-fault insurer alongside the rest of the credit hire submission.
Frequently asked questions
- Is this glossary legal advice?
- No. It explains accident-management terminology in plain English. Legal advice on personal injury, liability disputes or litigation must come from an authorised solicitor.
- Why do the definitions link to service and location pages?
- Many terms only make sense in context. Credit hire links to replacement vehicle support, ULEZ links to London replacement-vehicle issues, and MIB links to uninsured and hit-and-run support.
- How often are glossary terms reviewed?
- Terms are reviewed when the underlying law, FCA guidance, MIB agreements, emission-zone rules or repair standards change, and at least during scheduled pre-launch compliance review.
- Can a glossary definition decide my claim?
- No. Claim outcome depends on liability, policy position, evidence and the applicable insurer or MIB process. The glossary helps you understand the language used in that process.
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