UK ADR Compliance — Comprehensive Guide for TMs & FMs

For Transport Managers and Fleet Managers

Carriage of Dangerous Goods by Road in the UK

Version 1.0 — May 2026 Audience: Transport Managers, Fleet Managers, owner-operators, DGSA-supported businesses, and the back-office staff who keep the paperwork honest in operations involving dangerous goods. Scope: UK ADR-regulated road haulage. Covers all 11 hazard classes, the regulatory framework, the DGSA role, vehicle and driver requirements, documentation, and 2025 changes. Read alongside our General Haulage guide — ADR sits on top of the general regime, not instead of it.

Important. This guide describes the regulatory regime as we understand it in May 2026 (ADR 2025 edition in force, transitional period ended 30 June 2025). Compliance rules change. Always verify against current gov.uk, HSE, DfT, UNECE, and DGSA guidance before relying on any specific point. Where ADR detail is class-specific, your DGSA is the right person to consult. CheckPod is not a legal advisor.

Contents

1. What ADR is, and why it sits on top of everything else
2. The 11 hazard classes — what each one covers
3. The regulatory framework — ADR, CDG 2009, and the bodies that enforce
4. The Dangerous Goods Safety Adviser (DGSA) — your appointed expert
5. Driver requirements — the ADR Driver Training Certificate
6. Vehicle approval — VTG15, EX, FL, AT, MEMU, OX
7. Equipment to be carried — fire extinguishers, PPE, spill kits
8. Documentation — transport document, IIW, multilateral agreements
9. Placarding and marking — the orange plates and class diamonds
10. Tunnel restriction codes
11. Limited and Excepted Quantities (LQ / EQ) — the partial relief
12. Loading, unloading, and segregation
13. The 2025 changes — what's new
14. ADR roadside enforcement — what changes
15. Incident response — when something goes wrong
16. Building an ADR-ready operation
17. Sources and further reading

1. What ADR is, and why it sits on top of everything else

ADR is the European Agreement Concerning the International Carriage of Dangerous Goods by Road (Accord Européen relatif au transport international des marchandises Dangereuses par Route — French acronym, hence "ADR"). It's a UNECE treaty originally signed in 1957 and updated every two years on a 2-year cycle. The current edition is ADR 2025, in force since 1 January 2025, with the standard 6-month transitional period that ended on 30 June 2025.

In Great Britain, ADR is brought into domestic law by the Carriage of Dangerous Goods and Use of Transportable Pressure Equipment Regulations 2009 ("CDG 2009"), enforced under the Health and Safety at Work etc. Act 1974. Northern Ireland operates an equivalent regime under separate regulations.

Why ADR sits "on top": if you run an O-licence general haulage operation, you already comply with a substantial regulatory burden — Operator Licence undertakings, walkaround checks, drivers' hours, load security, OCRS. ADR adds another full regulatory layer on top:

• A separate appointed expert role (DGSA)
• Separate driver certification (ADR Driver Training Certificate)
• Separate vehicle approval where required (VTG15 for tankers, EX vehicles, MEMUs, etc.)
• Separate documentation in the cab (transport document, IIW)
• Separate equipment requirements
• Separate placarding/marking
• Separate enforcement authority (HSE alongside DVSA)
• Substantially elevated penalty regime (criminal prosecution under CDG, not just civil)

You do not get to choose ADR or general haulage. If you carry dangerous goods, you do both. The general haulage rules don't go away — they apply in full alongside ADR.

A note on terminology: "transport unit" in ADR means the vehicle (or combination — tractor + trailer is two vehicles but one transport unit). "Vehicle" includes trailers. Fire extinguisher and equipment requirements typically apply to the transport unit, but vehicle approval and certain markings apply to each vehicle.

2. The 11 hazard classes — what each one covers

ADR uses the UN classification system. Every dangerous good is assigned to one of nine classes; classes 1, 2, 4, 5, and 6 are subdivided into divisions, giving 11 distinct categories that drivers can be ADR-certified for.

(Classes 1, 2, 4, 5, 6 are formally divisions, but for driver certification and operational purposes they're often treated as 11 separable categories. Drivers can be certified for any combination, with separate certification for tank work.)

Mixed loads. Many real-world journeys carry more than one class. The most restrictive code in any combination dictates the regime — tunnel codes, segregation, equipment requirements all step up to the most restrictive. Mixed-class operations need particular attention to segregation rules (Part 7 of ADR).

Limited and Excepted Quantities (covered in Section 11) provide partial relief from the full ADR regime for small consignments. They do not exempt you entirely.

3. The regulatory framework — ADR, CDG 2009, and the bodies that enforce

The instruments:

• ADR 2025 (UNECE) — the technical rulebook. Annex A (substances, packaging, labelling) and Annex B (vehicles, equipment, operations). Updated biennially.
• Carriage of Dangerous Goods and Use of Transportable Pressure Equipment Regulations 2009 (CDG 2009) — the GB legal instrument that applies ADR domestically. Includes some GB-specific exemptions and modifications.
• Health and Safety at Work etc. Act 1974 — the general framework under which CDG offences are prosecuted.
• Carriage of Dangerous Goods and Use of Transportable Pressure Equipment Regulations (NI) 2010 — Northern Ireland equivalent.
• Manual for the Carriage of Dangerous Goods by Road (HSE) — the HSE guidance document operators rely on for interpretation.

The bodies:

• HSE (Health and Safety Executive) — enforcement of ADR/CDG, prosecution of breaches, guidance publication.
• DVSA (Driver and Vehicle Standards Agency) — roadside enforcement of vehicle and driver compliance, including ADR-specific roadside checks.
• DfT (Department for Transport) — policy lead, competent authority for ADR, appointed authority for DGSA examinations and ADR Driver Training Certificate issuance (via SQA).
• SQA (Scottish Qualifications Authority) — DfT's appointed body for ADR Driver Training Certificate issuance and for some DGSA exam administration.
• UNECE — international body that produces ADR.
• ONR (Office for Nuclear Regulation) — additional competent authority for Class 7 (radioactive) material.
• Environment Agency / SEPA / NRW / NIEA — environmental regulators with parallel interest in spill/release events.

The penalty profile.

General haulage non-compliance typically attracts civil penalties — Fixed Penalty Notices, prohibitions, OCRS impact, Public Inquiry consequences. ADR non-compliance can attract those and criminal prosecution under CDG 2009 / HSWA. HSE prosecution rates for serious ADR breaches are meaningful. Fines after conviction routinely run into tens of thousands of pounds; serious cases can reach six and seven figures.

This is part of why the DGSA is mandatory for most ADR-involved businesses — the consequences of getting it wrong make the cost of professional advice trivial in comparison.

4. The Dangerous Goods Safety Adviser (DGSA) — your appointed expert

ADR Chapter 1.8.3 requires most businesses involved in the carriage, packing, filling, loading, or unloading of dangerous goods to appoint a Dangerous Goods Safety Adviser. Since 2022, the obligation has extended to consignors as well — meaning many businesses that don't transport but do ship are now also captured.

Who needs one (UK position):

• Carriers (most road hauliers carrying DG)
• Packers and fillers
• Loaders and unloaders (with some exceptions)
• Consignors (since 2022)

GB exemptions (per CDG Reg 3(j) and DfT guidance):

• Carriage operations where ADR 1.1.3 (small loads, LQ, EQ) applies in full
• Operations where the main or secondary activity of the business is not the carriage of dangerous goods and the activity is genuinely occasional (DfT interprets "occasionally" as 1–2 journeys per month maximum)
• Carriage related to radioactive materials where ADR 1.7.1.4 applies (small radioactive loads)

These exemptions do not apply to international carriage. Many small operations think they qualify for exemption when they don't — get advice early.

The DGSA role:

A DGSA is a qualified individual (passed DfT-set examinations administered via SQA) holding a 5-year renewable certificate. Their core duties:

• Monitor compliance with ADR/CDG within the organisation
• Advise on dangerous goods carriage operations
• Prepare an annual report to the head of the business covering the organisation's DG activities (this is mandatory and the report is retained for 5 years)
• Investigate and report on accidents, incidents, or serious infringements
• Advise on staff training and procedures
• Advise on emergency procedures

Internal vs external DGSAs. Either model is valid. Many small-to-mid operators contract an external DGSA; larger ADR-heavy businesses appoint internal DGSAs. The contractual relationship must give the DGSA real access — they need to see procedures, walk the yard, inspect documentation, attend incident investigations.

Modes covered. A DGSA certificate specifies modes (road, rail, inland waterway) and may have class-specific endorsements. Class 7 (radioactive) typically requires an additional Class 7 module; the Office for Nuclear Regulation recognises a specific syllabus.

The annual report. This is your single most important DGSA-related document. It must be:

• Produced annually
• Cover the calendar year (typically)
• Address: organisation, activities, procedures, training, incidents, recommendations
• Retained for at least 5 years
• Available to enforcement on request

A DGSA who isn't producing annual reports isn't doing the job. A business that hasn't seen its DGSA's annual report doesn't have a functioning DGSA relationship.

Selecting a DGSA.

• DVSA publishes the official DGSA list at gov.uk
• Look for relevant class endorsements covering what you carry
• Modal coverage (road only, or road+rail+sea if you're multimodal)
• Sector experience (fuel haulage and clinical waste are very different worlds)
• Real availability — your DGSA needs to be reachable, not a name on a piece of paper

5. Driver requirements — the ADR Driver Training Certificate

Drivers carrying dangerous goods must hold an ADR Driver Training Certificate (ADR 8.2.2). Issued by SQA on behalf of DfT, in standard "credit card" photocard format, valid for 5 years.

Scope of certification. The certificate specifies:

• Classes the driver is qualified to carry. Classes 1 and 7 each require their own dedicated module. Other classes may be combined into a "core" certification (often called "all classes except 1 and 7") plus separate Class 1 and/or Class 7 modules.
• Tank endorsement, if the driver is qualified to carry in tanks (a separate module). Tank work is not permitted on a non-tank certificate.

The 11-class qualification (all classes including 1 and 7, with tank) is rare and represents the deepest possible ADR driver competence.

Initial training. Typically 5–7 days, depending on classes and tank addition. Conducted by a DfT-approved training provider. Covers:

• ADR structure and principles
• Hazard classification
• Marking, labelling, placarding
• Documentation
• Driver duties and responsibilities
• Equipment use
• Emergency procedures
• Tunnels and route planning
• Class-specific modules

Examination. SQA-set, multiple choice and (for tank module) practical. Pass marks set per module.

Refresher training. Every 5 years before certificate expiry. Required to renew. Drivers letting their certificate lapse must complete the full initial training again (not just refresher) — a costly and avoidable mistake.

ADR 2025 change — Limited Quantity drivers. Until 2025, drivers transporting dangerous goods only in Limited Quantities (LQ) were not explicitly required to hold an ADR certificate. ADR 8.2.3 has been clarified to require training certification for all personnel involved in such transport. This expands the population of drivers who need formal ADR training. Whether this requires the full ADR certificate or a more limited "LQ-only" qualification is being clarified — current good practice is to err on the side of full ADR training for drivers regularly carrying LQ goods.

Operational tracking. As with Driver CPC and vocational entitlement, every ADR certificate needs an expiry-date watch. 90-day forward-look minimum. A driver whose certificate expires overnight can no longer carry the goods they did yesterday.

Consignor and packer staff. Staff involved in classification, packing, loading, and documentation also need training. Not full ADR Driver Training Certificate, but documented role-relevant training under ADR 1.3. Records retained.

6. Vehicle approval — VTG15, EX, FL, AT, MEMU, OX

Some ADR carriage requires vehicles to hold a specific approval beyond standard vehicle registration. The certificate is the VTG15 (Goods Vehicle Annual Test Certificate for ADR vehicles), issued after annual ADR inspection by DVSA at an Authorised Testing Facility.

Vehicle types and the approvals they need:

Annual ADR inspection. Required for tank vehicles, EX vehicles, MEMUs, OX vehicles. Conducted at ATF, equivalent rigour to annual MOT plus ADR-specific items (tank integrity, electrical isolation, valve/discharge equipment, marking). Failure means the vehicle cannot carry DG until rectified and re-tested.

Construction standards (ADR Chapter 9.2 onwards):

• EX vehicles: enclosed body, suppressed electrical equipment, defined materials of construction
• FL vehicles: enhanced electrical isolation, specific construction for flammable atmospheres
• AT vehicles: tank construction standards, valve protection, anti-roll requirements

Most general haulage of packaged DG below tanker thresholds does not require special vehicle approval. A standard flatbed or curtain-sider can carry packaged paint, packaged corrosives, packaged batteries, etc., subject to the broader ADR rules on segregation, marking, equipment, and load security.

Tank operations are a different world. The vehicle approval is one piece; valve and discharge equipment certification, periodic tank pressure testing, and tank integrity records are all part of the regime. Tank work without a DGSA on hand is rare and rarely advisable.

7. Equipment to be carried — fire extinguishers, PPE, spill kits

ADR Chapter 8.1.4 (fire extinguishers) and 8.1.5 (miscellaneous equipment) set the equipment requirements. The list grows for specific hazard classes — your IIW Page 4 sets out the mandatory equipment for the classes you carry.

Fire extinguisher minimums (per transport unit):

A common, comfortable spec for an HGV transport unit is 2kg cab + 6kg + 6kg = 14kg (2kg over minimum).

Extinguisher conditions (ADR 8.1.4.3 and 8.1.4.4):

• Suitable for vehicle use
• Compliant with EN 3 standard
• Sealed (verifying not used)
• Marked with date of next inspection
• Will not release toxic gases under fire conditions
• Periodic inspection per national standards
• Easily accessible to crew
• Protected from weather

Inspections typically annual. The 55%-of-roadside-checks-flag-extinguisher-failings figure quoted in industry sources is consistent with HSE's enforcement priorities — the extinguisher is the most-failed equipment item at roadside.

Miscellaneous equipment per transport unit (ADR 8.1.5):

Always:

• 1 wheel chock per vehicle (so 2 for an artic — a rigid + drawbar combination is also 2 vehicles, 2 chocks)
• 2 self-standing warning signs (reflective triangles or cones)
• Eye-rinsing liquid (not required for some explosive/gas-only loads)

Per crew member:

• Hi-vis warning vest
• Pocket lamp (torch). Must be ATEX-rated if classes carried require it (e.g. flammable gas/liquid loads).
• Protective gloves
• Eye protection

Class-specific additions (per IIW Page 4):

• Drain seal: required for danger labels 3, 4.1, 4.3, 8, 9. ADR doesn't specify type — heavy plastic sheeting, commercial drain seal, or absorbent "sausage" all acceptable to UK enforcement.
• Shovel: required for danger labels 3, 4.1, 4.3, 8, 9. Plastic preferred, upturned sides ideal.
• Collecting container (bucket): required for danger labels 3, 4.1, 4.3, 8, 9. Doesn't need to be UN-approved; must be capable of holding spilled material without softening or being damaged.
• Emergency escape mask (if required by IIW for specific gas/toxic loads).

For Class 3 (flammable liquids) — ADR 2025 update: mandatory spill kits clarified as required. (Industry guidance flags this as a 2025 change worth verifying.)

For Class 7 (radioactive): specific equipment per ONR guidance, including dosimetry where applicable.

Equipment storage. Equipment must be available, accessible to the crew, protected from the elements. Some equipment lives in the cab; some lives in external lockers.

Important caveat. Drivers are not expected to act as quasi-emergency responders. The equipment is to enable the driver to take initial protective action (place warning signs, secure the scene, attempt small fire, contain a small spill) and to assist the emergency services on arrival. It is not a substitute for fire and rescue services for any meaningful incident.

8. Documentation — transport document, IIW, multilateral agreements

The cab of an ADR vehicle carries documentation general haulage doesn't. Three core documents:

1. Transport Document (sometimes "DGN" — Dangerous Goods Note).

ADR 5.4.1 sets the mandatory content. For each substance carried:

• UN number
• Proper Shipping Name
• Hazard class (and division/sub-hazards where applicable)
• Packing Group (where assigned)
• Number and description of packages
• Total quantity
• Names and addresses of consignor and consignee
• Tunnel restriction code (where carriage involves a restricted tunnel route — see Section 10)

ADR 2025 change (from July 2025): the transport document must be in the driver's cab. Previously, common practice was to attach to packages; ADR has clarified this and shippers must now ensure drivers receive the transport document for every consignment. This is an operational and procedural change worth dwelling on — it's a frequent cause of roadside non-compliance during the transition.

2. Instructions in Writing (IIW).

ADR 5.4.3 sets the content. The IIW is a standard 4-page model issued by UNECE. Critical points:

• The carrier provides the IIW to the crew before departure
• IIW must be in language(s) the crew can read and understand
• The full 4-page model must be provided as a single entity, regardless of how many classes carried
• Cannot be amended (text and translations are agreed; you cannot replace dashes with numbers, cannot insert custom content within the model)
• Pages 2 and 3 are general guidance; Page 4 is mandatory equipment list, which is what you check the cab against
• May be in electronic form (ADR 5.4.0.2 — but the consignor must be able to provide paper if requested; for international travel, paper is recommended)
• If taken out of the vehicle for any reason, must be returned before next DG carriage
• Located in the cab, readily available — this is mentioned at 5.4.3, not 8.1, but is a roadside enforcement focus

The 4-page model (current Version 4, published in ADR 2017 and confirmed through subsequent editions including ADR 2025):

• Page 1 — Actions in the event of an accident or emergency, in numbered general points
• Page 2 — Additional guidance to vehicle crew on hazard characteristics by class and personal protective measures
• Page 3 — Additional guidance to vehicle crew on hazard characteristics by class and additional measures
• Page 4 — Equipment for general and personal protection (the mandatory equipment list)

UNECE publishes the IIW in 22 languages on the UNECE website. Multi-national crews need each member to have a version they can read.

3. ADR Driver Training Certificate.

Already covered in Section 5. Must be in the driver's possession when driving a vehicle in scope.

4. Multilateral Agreements (where applicable).

Sometimes a derogation from ADR is available for specific loads/routes via multilateral agreement between contracting parties. Where the operation relies on such an agreement, a copy must be carried. UNECE maintains a list of agreements.

5. Operator licence disc, vehicle docs, walkaround, tacho card — all the general haulage documentation continues to apply.

Documentation retention.

• Transport documents: typically 3 months minimum (ADR; some operators keep longer for operational/customer reasons)
• DGSA reports: 5 years minimum
• Training records: 5 years minimum
• Tank approval certificates: indefinite (operational)
• Annual DGSA report: 5 years minimum

9. Placarding and marking — the orange plates and class diamonds

ADR Chapter 5.3 sets the rules. The two main markings on an ADR vehicle:

Orange plates. Plain orange retroreflective plates displayed front and rear of the transport unit. For tank vehicles and bulk carriage, additional plates display:

• Hazard Identification Number (HIN, also called Kemler code) — top half — typically 2-3 digits indicating hazard properties (e.g. "33" for highly flammable liquid; "X" prefix for water-reactive)
• UN Number — bottom half — 4 digits identifying the specific substance

For packaged carriage, the plain orange rectangle on front and rear is sufficient (no specific UN number on the plate itself — that's on the package labels).

Side placards (large class diamonds). Required for:

• Tank vehicles (all four sides)
• Vehicles carrying packages of certain classes in larger quantities
• Bulk carriage

The placard is the class-shaped diamond (e.g. Class 3 red diamond with flame; Class 8 black/white split with corrosive symbol).

On packages themselves (handled by the packer/consignor primarily, but driver should verify):

• Class diamond labels (smaller version of the placard)
• UN number marking
• Proper Shipping Name
• Subsidiary hazards where applicable
• Limited Quantity / Excepted Quantity markings where applicable

Mixed loads. When carrying multiple classes, side placards typically show all classes carried (or the most restrictive subset, depending on quantity). Front and rear orange plates remain.

When not carrying DG. Placards must be removed or covered when the vehicle is not carrying DG. A vehicle showing placards while empty (or while carrying non-DG cargo) is itself a roadside-enforcement issue. Many operators use magnetic placards or covered fixed placards for flexibility.

Empty uncleaned tanks. Continue to display placards corresponding to last load carried until cleaned/degassed and certified. Cleaning includes 15-minute fire engulfment criteria for some hazards (relevant where empty tankers move through restricted tunnels).

10. Tunnel restriction codes

ADR Chapter 1.9.5 introduced tunnel restriction codes in 2007, with full effect from 1 January 2010. The system controls which dangerous goods may pass through which tunnels.

Tunnel categories (the tunnel itself):

• Category A — no restrictions
• Category B — most restrictive
• Category C — significant restrictions
• Category D — moderate restrictions
• Category E — least restrictive (still some restrictions)

(B is most restrictive; E is least. Category A is unrestricted and signs not required.)

Goods restriction codes (assigned per UN number, found in ADR Chapter 3.2 Table A, column 15):

• (B), (B/D), (B/E): strictest. Often specific to bulk/tank carriage
• (C), (C/D), (C/E): intermediate
• (D), (D/E): common; many flammables
• (E): least restrictive
• (—): no tunnel restriction

Format examples: "(D/E)" means restricted from D and E tunnels in bulk/tank, restricted from E tunnels in packages. The simple rule: a load with code "X/Y" cannot use a tunnel of category X or more restrictive when carried in bulk/tank, and cannot use a tunnel of Y or more restrictive when carried in packages.

UK tunnel categorisation. Nine major UK road tunnels were categorised under ADR. Examples:

• Mersey Tunnels (Kingsway, Queensway): Category D
• Dartford Tunnel: Category C
• Blackwall Tunnel: Category E

Full current list at gov.uk (search "ADR tunnel categories") — verify before route planning, categorisation can change.

Eurotunnel is not subject to ADR tunnel categories — it has its own more restrictive policy. Plan separately for Channel crossing.

Mixed loads. The most restrictive tunnel code in the load applies to the entire load — you don't pick and choose by package.

Practical application.

• Tunnel restriction code must appear in the transport document (ADR 5.4.1.1.1 (k)) where carriage involves potential tunnel use
• Modern HGV satnav often includes tunnel category data — verify against gov.uk independently before relying on it
• Routing around restricted tunnels can add significant journey time — factor into drivers' hours and customer ETA
• LQ and EQ goods are not subject to tunnel restrictions (ADR 1.9.5.3.6 and 8.6.3.3) — partial relief
• Some tunnels (notably the Mersey) have escort requirements for certain load profiles. Local byelaws apply.

11. Limited and Excepted Quantities (LQ / EQ) — the partial relief

Most of ADR is built around the assumption you're carrying meaningful quantities of dangerous goods. For genuinely small consignments, the regime offers partial relief.

Limited Quantities (LQ) — ADR Chapter 3.4.

Where a consignment fits within the LQ limits for its UN number (per Table A column 7a), most ADR provisions don't apply, but some still do:

• Special LQ marking on packages (the diamond LQ mark)
• Outer packaging of robust construction
• Maximum 30kg gross per package; some specific limits per substance
• Driver training certification (ADR Driver Training Certificate) now required from ADR 2025 — this is the change clarifying ADR 8.2.3
• Tunnel restrictions do not apply (1.9.5.3.6)
• DGSA may not be required (depends on volume)
• Documentation requirements relaxed

LQ is the regime under which much routine industry shipment of paints, aerosols, small adhesives, household chemical retail goods, etc. moves.

Excepted Quantities (EQ) — ADR Chapter 3.5.

Even smaller consignments, in much-reduced quantities per inner and outer packaging. Almost all ADR requirements relaxed, but:

• Specific EQ marking on outer packaging
• Quantity limits per inner/outer packaging
• Outer packaging robust construction
• Some basic documentation

EQ is the regime under which sample shipments, very small specialist consignments, and certain courier traffic moves.

The "1.1.3.6 thresholds" (small loads relaxation).

A separate but related concept — for some classes/transport categories, carriage below specified thresholds (per transport unit) attracts a relaxed regime. This is widely referred to as "below ADR" carriage. The thresholds are class- and packing-group-specific and detailed in ADR 1.1.3.6.

When operating below 1.1.3.6 thresholds, much of the full ADR regime relaxes — but fire extinguisher (1 × 2kg minimum), driver awareness, basic documentation, and packaging requirements still apply. This is not "no rules," it's "fewer rules."

Knowing where you sit. The DGSA's job is partly to advise on this. Many businesses think they're operating in LQ or below-threshold when they're actually full ADR. Get it confirmed in writing for each substance you carry.

12. Loading, unloading, and segregation

ADR Chapter 7 governs carriage, loading, unloading, and handling. The headline operational rules:

Segregation.

Some classes cannot be loaded together. The segregation rules are class-pair specific (e.g. Class 1 explosives must not be loaded with most other classes; Class 5.1 oxidisers must not be loaded with Class 3 flammables in some packing groups).

For mixed loads, the key tools:

• ADR Table 7.5.2.1 — segregation table
• DGSA advice for specific load combinations
• Vehicle/container compartmentation where physical separation is required

A common mistake: assuming "low quantity = no segregation rule." The rules apply to packaged DG generally, with relief for very small quantities only.

Loading practices.

• Pre-loading inspection: vehicle bed clean, no incompatible residues, anchorage and equipment serviceable
• Packaging integrity: no leaks, no damage, labels legible, UN markings present
• Stowage: stable without lashings (the general rule), additional restraint as required
• Class-specific stowage: Class 1 (explosives) typically requires very specific stowage; Class 7 (radioactive) requires distance from regularly occupied positions
• Securing: same load-security standard as general haulage (0.8g forward, 0.5g sideways/rearward) plus class-specific stowage

Loading at premises.

The loader has duties under ADR (Chapter 1.4.3.1) including verification of:

• Goods authorised for road carriage
• Marking and labelling correct
• Vehicle clean and free of incompatible residue
• Vehicle suitable for the load

Many sites have specific loading procedures (queuing, signage, dedicated loading bay, mandatory PPE, banksman/marshall present, drainage interception). Driver follows the site procedure; operator ensures driver is briefed.

Unloading.

Symmetric set of duties at the receiving site. Driver should remain present (or accessible) during unloading; if leaving the vehicle, follow site procedure. Empty uncleaned packaging continues to be regulated as DG until cleaned.

Supervision and parking.

Some loads require supervised parking. ADR 8.4 details the requirements. Class 1 loads above defined quantities have specific supervision rules; loaded LPG tankers have specific overnight parking restrictions; certain Class 7 loads require dedicated arrangements.

A loaded ADR vehicle parked overnight in a public car park is, for many class/quantity combinations, a regulatory issue. Plan parking in advance.

13. The 2025 changes — what's new

ADR 2025 came into force on 1 January 2025 with the standard 6-month transition ending 30 June 2025. As the operator/TM/FM, you should already have transitioned; in May 2026 these are settled rules. Key changes worth knowing:

Documentation in cab (from July 2025). Transport documents must be carried in the driver's cab, not simply attached to packages. Shippers must provide drivers with a copy for every consignment. Drivers must be issued the document along with other paperwork (IIW, licence, etc.).

Limited Quantity driver training (ADR 8.2.3 clarified). Drivers transporting DG in Limited Quantities now require a training certificate. Previously implicit; now explicit. Operators historically running LQ work without ADR-certified drivers need to retrain or restructure.

Battery classifications and labelling. New UN numbers and packing instructions for sodium-ion batteries:

• UN 3551 — Sodium-ion batteries
• UN 3552 — Sodium-ion batteries with/contained in equipment
• UN 3558 — Sodium-ion battery-powered vehicles

The "lithium battery mark" has been renamed the "battery mark" to cover both lithium and sodium-ion batteries. The Class 9 lithium battery hazard label has been renamed to lithium battery and sodium-ion battery hazard label.

11 new UN Numbers. Including:

• UN 3556 — Lithium-ion battery-powered vehicles
• UN 3553 — Disilane
• UN 0514 — Fire suppressant devices

Expanded definitions. For explosives, flammable solids, and fire suppressant devices — clarified for classification consistency.

Equipment and operational changes. Industry guidance has flagged:

• Revised fire extinguisher volume ratios (verify against current ADR 8.1.4 text — the headline minimums remain as documented above, but specific class-additional requirements have been refined)
• Mandatory spill kits clarified for Class 3 flammable liquids
• QR-code-based Tremcards now accepted as supplementary, but the printed 4-page IIW remains mandatory

DfT call for evidence on DGSA role (October 2024 to January 2025). Outcome under review at time of writing. May lead to changes in the DGSA scope (which businesses need one, what the role looks like). Monitor gov.uk for outcome publication.

ADR 2027 scheduled for 1 January 2027, transitional ending 30 June 2027. Expect biennial cycle to continue.

14. ADR roadside enforcement — what changes

ADR roadside checks are conducted by DVSA (general roadworthiness/driver/tacho) and may include HSE (ADR-specific elements) depending on the operation and intelligence picture. ADR roadside checks are typically more intensive than general haulage stops.

What gets checked beyond the general haulage list:

• ADR Driver Training Certificate (presence, validity, class scope, tank scope)
• Transport document (presence in cab from July 2025; correct content per ADR 5.4.1)
• Instructions in Writing (presence, in cab, in language driver understands, current 4-page model)
• Vehicle approval (VTG15 where required)
• Placards and orange plates (presence, correctness, UN number/HIN where applicable)
• Equipment list (fire extinguishers — date, seal, capacity; PPE; spill kit; class-specific items)
• Load condition and segregation
• Tunnel restriction code on transport document where applicable
• Driver competence questions on the load (UN number, hazards, fire drill)

Outcomes parallel general haulage but with criminal-prosecution potential under CDG 2009:

• Verbal warning
• Fixed Penalty Notice
• Delayed prohibition (vehicle returns to base, off-road until cleared)
• Immediate prohibition (vehicle stays put)
• Referral to HSE for prosecution consideration
• Referral to Traffic Commissioner

The 55% extinguisher figure. Industry data suggests around 55% of ADR roadside checks identify extinguisher non-compliance — wrong capacity, expired seal, missing inspection date, inaccessible storage. Documentation errors are the second-most-common finding. These two areas are where most operators get caught; both are easily prevented by routine self-check.

HSE involvement. Where roadside findings indicate systemic failure, HSE may follow up with a depot visit, document audit, or prosecution action. HSE has powers under HSWA to issue Improvement Notices (require fixing within a period) and Prohibition Notices (stop the activity until fixed). Failure to comply with either is a criminal offence in itself.

15. Incident response — when something goes wrong

ADR incidents are not just operational events — they're regulatory events with multiple notification obligations.

Driver immediate response (per IIW Page 1):

• Stop the vehicle, switch off engine, isolate batteries where possible
• Apply parking brake
• Avoid sources of ignition (no smoking, no electrical activation)
• Inform emergency services (give location, hazards, UN numbers, transport document detail)
• Don warning vest, place warning signs (front and rear, appropriate distance)
• Keep public away
• Provide information to first responders (transport document, IIW)
• Do not attempt to deal with anything beyond a small incipient fire or small spill
• Contact operator

Operator immediate response:

• Verify driver and crew safety
• Ensure emergency services notified
• Notify DGSA (mandatory for any reportable incident — DGSA writes the formal report)
• Contact carrier insurance, customer (consignor) as relevant
• Activate emergency response contractor where applicable (specialist environmental clean-up firms; some hazardous loads require specialist response capability)
• Begin internal incident log

Notification obligations:

• Police: if road traffic accident, public hazard, or required to manage scene
• HSE: if reportable under RIDDOR (most ADR-related incidents involving release, fire, injury are RIDDOR)
• Environment Agency / SEPA / NRW / NIEA: if release to environment (water, drainage, soil, air)
• DGSA: for the internal incident report and review
• Insurer: typically within 24 hours
• Local authority: for some incidents

The DGSA incident report. ADR 1.8.3.6 requires the DGSA to prepare an incident report following any DG accident or serious incident. This sits alongside the annual report and is part of the evidence chain in any subsequent enforcement action. Retain for at least 5 years.

Subsequent investigation. Significant ADR incidents often result in:

• HSE site visit and follow-up
• Insurance investigation
• Customer (consignor) investigation
• Possible prosecution by HSE / DfT / EA / police
• Possible Traffic Commissioner referral
• Public Inquiry potential where the operator's broader compliance is in question

The window between incident and prosecution decision is typically 6–18 months in serious cases. Document everything in real time.

16. Building an ADR-ready operation

The general fleet compliance principles all apply (single source of truth, forward-look, audit trail by default, role separation, document the abnormal). On top, ADR adds these operational disciplines:

1. The DGSA relationship. Treat your DGSA as a real adviser, not a paper appointment. Weekly or monthly contact. Annual report taken seriously. Visible on the yard. Available by phone in incidents. The operators who get DGSA right rarely have ADR enforcement problems.

2. Driver training matrix. Track every driver's:

• Vocational entitlement and medical
• Driver CPC / DQC
• ADR Driver Training Certificate — including class scope and tank flag
• Site-specific inductions (fuel terminals, chemical sites, hospital waste sites, etc.)
• Class-specific in-house briefings

3. Vehicle competence matrix. Track per vehicle:

• Standard MOT and PMI
• ADR vehicle approval (VTG15) if applicable
• Tank periodic testing if applicable
• Equipment compliance (extinguishers, spill kit, PPE)
• Placard and orange plate condition

4. Documentation discipline. Every ADR consignment should generate:

• Transport document with correct content per ADR 5.4.1
• IIW Page 4 verified against in-cab equipment
• Tunnel restriction code where applicable
• Multilateral agreement copy where applicable
• Customer-side documentation as required

5. Pre-departure check. Beyond general haulage walkaround, an ADR pre-departure check covers:

• Equipment present (fire ext, PPE, drain seal, shovel, bucket where applicable)
• Documentation present (transport doc, IIW, ADR cert, vehicle docs)
• Placards correct or covered
• Load segregation appropriate
• Tunnel route considered

6. Customer-side competence. Many DG shipments come from sophisticated consignors (chemical manufacturers, fuel terminals) with their own regimes. Some come from less sophisticated consignors (small manufacturers, occasional shippers, end-customer collection). Verify what you're being given. The carrier has duties under ADR 1.4.2.2 to verify (within reason) that goods are properly classified, packaged, and documented.

7. Periodic drill. Real ADR incidents are rare for most operators. Drivers may go years without a real one. Drill the response: tabletop exercises, scenario walk-throughs, refresher modules. The window between "I've never used this kit" and "I need it now" is the moment competence matters.

8. Escalation routes. Driver in doubt → office contact → DGSA → emergency services. Make the routes clear and the contact details current.

Quarterly self-audit (ADR-extended version of the general principle). Pick a random ADR consignment from the last 90 days. Find:

• Transport document (correct content)
• IIW issued for the journey
• Driver ADR certificate at the time
• Vehicle approval at the time
• Equipment record from the period
• DGSA awareness of the consignment type
• Placard/marking record (photo if you keep them)
• Tunnel restriction consideration in route

If any of those are missing, tighten the system.

17. Wellbeing — yours and your team's

Running a fleet is stressful work. PI threats, driver crises, financial pressure, the weight of decisions that affect other people's livelihoods. Most TMs and FMs carry it alone.

You're not alone, and looking after yourself isn't soft — it's part of running a safe operation.

If you or someone in your team is struggling:

• Mates in Mind — matesinmind.org (transport-specific, free, confidential)
• Andy's Man Club — andysmanclub.co.uk (free peer-led men's mental health groups, UK + online, Mondays 7pm)
• Samaritans — 116 123, 24/7
• GP for clinical support
• Your insurer's EAP if you have one — most fleet insurance includes mental health support
• Your trade body — RHA and Logistics UK both run wellbeing programmes for members

18. Sources and further reading

All references current as of May 2026. URLs subject to change; if a link is dead, search gov.uk or unece.org for the document title.

Primary regulatory documents

• ADR 2025 (UNECE) — unece.org/transport/dangerous-goods/adr-2025
• Carriage of Dangerous Goods and Use of Transportable Pressure Equipment Regulations 2009 (CDG 2009) — legislation.gov.uk
• HSE Manual for the Carriage of Dangerous Goods by Road — hse.gov.uk/cdg
• DGSA guidance — gov.uk/government/publications/carriage-of-dangerous-goods-guidance-note-19/employing-a-dangerous-goods-safety-adviser
• ADR instructions in writing — gov.uk/government/publications/adr/adr-instructions-in-writing
• ADR tunnel categories (UK) — gov.uk/government/publications/transporting-dangerous-goods-adr-tunnel-categories/adr-tunnel-categories
• Driving dangerous goods and special loads abroad — gov.uk/guidance/driving-dangerous-goods-and-special-loads
• Dangerous Goods Driver — Regulated Professions Register — gov.uk

Statutory framework

• Health and Safety at Work etc. Act 1974
• Carriage of Dangerous Goods (Classification, Packaging and Labelling) and Use of Transportable Pressure Receptacles Regulations 1996 (predecessor framework, retained references)
• Radioactive Material (Road Transport) Regulations 2002 (for Class 7)

International

• UNECE ADR portal — unece.org/transport/road-transport/about-adr
• UNECE IIW translations (22 languages) — unece.org/transport/road-transport/linguistic-versions-adr-instructions-writing
• UNECE multilateral agreements list — unece.org/transport/dangerous-goods/multilateral-agreements

Bodies and guidance

• HSE — hse.gov.uk
• DVSA — gov.uk/government/organisations/driver-and-vehicle-standards-agency
• DfT — gov.uk/government/organisations/department-for-transport
• ONR (Class 7) — onr.org.uk
• SQA (DGSA exams, ADR Driver Training Certificate) — sqa.org.uk

Industry

• Chemical Business Association — chemical.org.uk
• Cogent Skills (sector skills body) — cogentskills.com
• DGSA Network — networking, training, peer support

Specialist legal advice

• Transport regulatory solicitors (multiple firms specialise; for serious ADR matters seek named expertise)
• Environmental regulatory solicitors (for spill/release prosecution)

Class-specific resources

• Class 1: HSE Explosives Inspectorate
• Class 2: British Compressed Gases Association — bcga.co.uk
• Class 3: Petroleum industry guidance (UKPIA)
• Class 7: ONR; Society for Radiological Protection
• Class 8: Chemical Industries Association
• Clinical waste (parts of 6.2): specialist sector guidance

A final word

ADR is a regulatory regime, not a list of rules. It demands appointed expertise (DGSA), trained drivers (ADR Driver Training Certificate), approved vehicles, specific equipment, structured documentation, and a culture of compliance that treats the carriage of dangerous goods with the seriousness it warrants.

The fleets that fail at ADR don't usually fail because the rules are too hard. They fail because:

• The DGSA was a name on a piece of paper, not a working relationship
• Equipment slipped — extinguisher dates expired, spill kits got "borrowed," PPE went home
• Documentation was patchy — IIW out of the cab, transport doc on the package, ADR certificate at home
• A new substance was added to the operation without DGSA review
• A driver's certificate lapsed without anyone noticing
• An incident response procedure was never drilled, then needed for real

The fleets that succeed are not perfect. They're disciplined. The DGSA is consulted. The training matrix is current. The pre-departure check is honest. The annual report is taken seriously. The incident drills happen.

If you've read this far, you're in the top quartile of ADR operators. The next step is to use it.

CheckPod. Check it. Prove it. Drive it.

Built by people who actually drive the vehicles — including the ones with placards on.

This guide is provided for general information only and does not constitute legal, DGSA, or professional advice. Always verify against current ADR 2025, gov.uk, HSE, and DGSA guidance, and seek specialist advice for your specific circumstances.