ADR Driver — The Comprehensive Guide

For Drivers

Carriage of Dangerous Goods by Road in the UK

Version 1.0 — May 2026 Audience: Professional drivers carrying dangerous goods on UK roads under ADR. Scope: What you need to know to drive ADR work compliant and stay compliant. Covers all 11 hazard classes, the documentation, the equipment, the in-cab discipline, the roadside check, and the day something goes wrong. Read alongside our General Haulage Driver guide — ADR sits on top of general haulage, not instead of it.

Important. This guide describes the rules as they stood in May 2026 (ADR 2025 in force, transitional period ended 30 June 2025). Compliance rules change. Always check the latest gov.uk, HSE, UNECE, your operator's procedures, and any briefings from your DGSA or TM. CheckPod is not a legal advisor.

Why this guide exists

ADR work is not general haulage. The training is longer, the certificate is separate, the in-cab paperwork is heavier, the equipment list is longer, the placards mean something, and the consequences of getting it wrong are bigger.

Most ADR drivers do this work properly every day for years without incident. The job is repetitive enough that the dangerous-goods part fades into the background — until the moment something doesn't go to plan, and you're suddenly the one person on scene who knows what's in those packages.

This guide is built around that fact. Compliance is what makes the routine days legal. Your training and your equipment are what make the bad day survivable.

Your responsibilities — what changes under ADR
Your ADR Driver Training Certificate
The 11 classes — quick driver's reference
Documents you carry on every ADR shift
The Instructions in Writing — Pages 1, 2, 3, and the all-important Page 4
The vehicle — equipment check and approval
Placards and orange plates
Tunnel restriction codes — routing your job
Loading, unloading, and segregation
The 2025 changes you should know about
At a roadside ADR check
Incident response — the day it happens
Personal welfare in ADR work
Sources and further reading

1. Your responsibilities — what changes under ADR

Everything in your General Haulage Driver guide still applies — vocational entitlement, Driver CPC, walkaround, drivers' hours, tachograph, load security. ADR is on top.

What changes:

You need an ADR Driver Training Certificate for the classes (and tank, if applicable) you're carrying. Without it, in scope, you're committing an offence — and so is your operator.
You're personally responsible for the in-cab documentation. Transport document, IIW (Instructions in Writing), and ADR certificate must be on you / in the cab.
You're personally responsible for the equipment being present and serviceable — fire extinguishers, PPE, drain seal, shovel, bucket, eye-rinse where required.
Placards/orange plates are correctly displayed when carrying DG, and removed or covered when not.
You drive within tunnel restriction codes — wrong tunnel with the wrong load is an offence and potentially catastrophic.
You handle the load within ADR's loading, segregation, and unloading rules.
You respond to incidents under the IIW Page 1 procedure.
Penalties are heavier. ADR breaches under CDG 2009 are criminal offences, not just FPNs. HSE prosecutes serious breaches.

The carrier (operator), consignor (shipper), packer, loader, and driver all have specific duties under ADR Chapter 1.4. The driver's duties are real and personal — you cannot fully delegate them upstream.

2. Your ADR Driver Training Certificate

The card is your professional licence to carry dangerous goods. Standard "credit card" photocard format, issued by SQA on behalf of DfT, valid 5 years from issue.

What's on it:

Your photo and name
Issue date and expiry date
Classes you're certified for (e.g. "Classes 2, 3, 4.1, 4.2, 4.3, 5.1, 5.2, 6.1, 6.2, 8, 9" — the so-called "core" all-classes-except-1-and-7)
Class 1 flag if you've done the explosives module
Class 7 flag if you've done the radioactive module
Tank flag if you're certified for tank work
Security features (printed and digital)

What "all 11 classes" means. A driver who has Classes 1, 2, 3, 4.1, 4.2, 4.3, 5.1, 5.2, 6.1, 6.2, 7, 8, 9, plus tank — that's the deepest possible ADR competence. (Counted as 11 driver-distinct categories: Classes 1, 7, and the "core 9" remaining classes/divisions, with tank as a flag rather than a class.)

Initial training.

5–7 days minimum, depending on classes and tank module. DfT-approved provider only. Course covers ADR principles, classification, documentation, equipment, emergency response, plus class-specific sessions for Class 1 and Class 7 if undertaken. SQA exam at the end.

Refresher (every 5 years).

Shorter than initial — typically 3 days for core, more if Class 1, Class 7, and tank are all in play. Take the refresher before your card expires. If the certificate lapses, you must do the full initial training again — you don't get to refresh a dead card.

Practical advice:

Calendar the expiry date. Set a reminder 12 weeks before. Don't be the driver who finds out at the gate that they expired yesterday.
Carry the card every working day when in scope of ADR.
If lost or stolen, notify SQA and apply for replacement. You cannot carry DG without it.
Check the classes on your card match what you're being asked to carry. Carrying Class 1 on a no-Class-1 certificate is unlicensed.

ADR 2025 change — Limited Quantities. ADR 8.2.3 has been clarified to require driver training for personnel transporting DG even in Limited Quantities. If you regularly run LQ work and don't yet hold a full ADR certificate, ask your operator about training.

3. The 11 classes — quick driver's reference

You don't need to memorise every UN number, but you should be able to look at your transport document and the placards on your trailer and know — in headline terms — what you're carrying and what its main hazards are. Your training covers this in detail per class; this is the at-a-glance reminder.

Class 1 — Explosives

What it covers: Fireworks, ammunition, detonators, blasting agents, propellants, pyrotechnics.

Driver headline: Fire is the catastrophic event. Avoid heat, sparks, friction, impact. Most Class 1 work is conducted under specific quantity rules; some loads need supervised parking. Class 1 is its own world — drivers without the Class 1 module on their certificate cannot carry it.

Vehicle: Often EX/II or EX/III approved, depending on quantities and types.

Class 2 — Gases (Divisions 2.1, 2.2, 2.3)

What it covers: - 2.1 — flammable gases (LPG, propane, butane, acetylene, hydrogen) - 2.2 — non-flammable, non-toxic gases (nitrogen, oxygen, argon, CO₂) - 2.3 — toxic gases (chlorine, ammonia, sulphur dioxide)

Driver headline: Pressure is the hidden hazard with all gases. Cylinders and tanks under pressure are dangerous in fire (BLEVE — Boiling Liquid Expanding Vapour Explosion). With 2.1, ignition sources are the immediate concern. With 2.3, toxic release is potentially fatal — keep upwind of any leak. Acetylene is unstable above certain pressures and once impacted may be unstable for hours.

Vehicle: Tank carriage typically FL approval. Cylinder carriage often standard vehicle.

Class 3 — Flammable liquids

What it covers: Petrol, diesel (UN 3082 / UN 1202 depending on flashpoint), kerosene, paints, thinners, solvents, alcohols, adhesives.

Driver headline: Flashpoint is the property — the lower the flashpoint, the more easily it ignites. Vapours travel; ignition sources at distance can ignite a leak. Static electricity is a real ignition source — earthing during loading/unloading matters. Spill kits required (clarified under ADR 2025).

Vehicle: Tank carriage FL. Packaged carriage standard vehicle.

Class 4.1 — Flammable solids

What it covers: Matches, sulphur, certain self-reactive substances, organic peroxides in some forms.

Driver headline: Burns readily, may burn vigorously. Self-reactive substances may decompose rapidly. Heat is the trigger; segregation from heat sources matters.

Class 4.2 — Spontaneously combustible

What it covers: White phosphorus, certain seed cake, oily fish meal, some industrial residues.

Driver headline: Will ignite without external ignition source on contact with air. Packaging integrity is everything. A damaged package is an immediate fire risk.

Class 4.3 — Dangerous when wet (water-reactive)

What it covers: Sodium, potassium, calcium carbide, magnesium powder, aluminium phosphide.

Driver headline: Water + this load = hydrogen + heat = potential fire/explosion. Do not use water on a 4.3 fire. Special considerations for unloading at sites (no rain, no wet surfaces). Spill kits do not include water-based equipment for these loads.

Class 5.1 — Oxidising substances

What it covers: Hydrogen peroxide, ammonium nitrate, sodium chlorate, calcium hypochlorite.

Driver headline: Doesn't burn itself but accelerates the burning of other materials. Will turn a small fire into a large one. Segregation from organic materials, fuels, and reducing agents is critical. Some 5.1 substances (notably ammonium nitrate at scale) have explosion potential under fire conditions.

Vehicle: Tank carriage of hydrogen peroxide solutions above 60% requires OX-approved vehicle.

Class 5.2 — Organic peroxides

What it covers: Various commercial organic peroxides (often used in plastics manufacture, polymer cure systems).

Driver headline: Self-decomposing; many require temperature control in transport. Loss of refrigeration = potential runaway decomposition. Many organic peroxides are also flammable. Specific stowage and class-specific equipment.

Class 6.1 — Toxic substances

What it covers: Pesticides, cyanides, arsenic compounds, mercury compounds, many laboratory chemicals.

Driver headline: Harmful by ingestion, inhalation, skin contact (dependent on substance). Eye-rinse required. PPE matters. In a release event, keep upwind, prevent ingress to eyes/mouth/skin.

Class 6.2 — Infectious substances

What it covers: Clinical waste, biological samples (Categories A and B), certain medical materials, used sharps containers.

Driver headline: Biohazard. Specific packaging standards. Some Category A materials require specific notifications and routing. Don't open packages. PPE and bagging procedure if a package is breached.

Class 7 — Radioactive material

What it covers: Industrial radiography sources, medical isotopes, nuclear fuel cycle material, smoke detectors at scale.

Driver headline: Radiation dose is the hazard. Specific packaging (Type A, Type B(U), Type B(M), Type C). Specific transport indices governing how close packages can be to people. ONR alongside HSE/DVSA enforcement. Drivers carrying Class 7 typically have additional dosimetry in some contexts. Do not carry without the Class 7 module on your certificate.

Class 8 — Corrosive substances

What it covers: Sulphuric acid, sodium hydroxide (caustic soda), hydrochloric acid, hypochlorite solutions, batteries (some types of stored electrolyte), nitric acid.

Driver headline: Will damage skin, eyes, lungs, vehicle, infrastructure, environment. Eye-rinse essential. PPE essential. Spill response procedure depends on whether it's acid or base — generally containment first, neutralisation only with specialist input. Many corrosives also have secondary hazards (oxidising, toxic).

Vehicle: Tank carriage typically AT-approved.

Class 9 — Miscellaneous

What it covers: Lithium-ion batteries, sodium-ion batteries (UN 3551–3558, new in ADR 2025), asbestos, environmentally hazardous substances, dry ice, fuel cells, lithium-battery-powered vehicles, magnetised material above thresholds.

Driver headline: Mixed bag. Lithium battery fires are the operationally significant Class 9 risk — high-energy thermal runaway, hard to extinguish, restart potential after apparent suppression. Quantity and packaging integrity matter. The "lithium battery mark" was renamed the "battery mark" in ADR 2025 to cover sodium-ion batteries too.

4. Documents you carry on every ADR shift

In the cab, every working ADR day:

Your driving licence (photocard)
Your DQC (Driver Qualification Card — Driver CPC)
Your ADR Driver Training Certificate (the card)
Your tacho card (digital)
Today's walkaround record (and previous shifts on this vehicle)
The transport document(s) for the consignment(s) you're carrying — in the cab, from July 2025 onwards (ADR 2025 change; the days of relying on documents attached to packages are over)
The Instructions in Writing (IIW) — current 4-page model, in language you can read, in the cab
Vehicle approval certificate (VTG15) if your vehicle is EX/II, EX/III, FL, AT, OX, or MEMU
Operator licence disc (displayed)
Vehicle insurance, MOT, V5 etc.
Multilateral agreement copy if your operation relies on one
Customer-specific paperwork (delivery notes, weighbridge tickets, site induction cards)

Important. "I think it's in the cab" is the wrong answer. The transport document in the cab and the IIW in the cab are roadside-enforcement priorities since the 2025 changes. Both should be readily available — in the seat-back document holder, the door card pocket, or the dedicated paperwork tray. Not buried in a bag in the bunk.

5. The Instructions in Writing — Pages 1, 2, 3, and the all-important Page 4

The IIW is your in-cab emergency reference. Standard 4-page model, current Version 4 (in force since ADR 2017, confirmed under ADR 2025), issued by UNECE in 22 languages.

Critical points up front:

The IIW is one document — all 4 pages, as a single entity
It is provided by the carrier (your operator), not the consignor
It must be in language(s) you can read and understand
It cannot be amended — you cannot replace the dashes with numbers, you cannot insert custom text in the body, you cannot omit pages
You may add supplementary pages, but they must be additional, not inserted within the model
You should consult the IIW before starting the journey to inform yourself of the loaded goods (ADR 5.4.3.2)

Page 1 — Actions in the event of an accident or emergency

The numbered list of immediate actions. Headline points (paraphrased):

Stop and apply brakes; switch off engine; isolate batteries where applicable
Avoid sources of ignition (no smoking, no flames, no electrical activity)
Inform emergency services with as much information as possible (location, hazards, UN numbers)
Don the warning vest; place self-standing warning signs (front and rear at appropriate distance)
Keep transport documents accessible for emergency responders
Keep public away
Tackle minor incipient fires only — do not attempt anything more
Evacuate the area in the event of significant release
Provide information to first responders on arrival

These are general actions. Specific responses depend on the load, which is what Pages 2 and 3 are for.

Pages 2 and 3 — Class-specific hazard reminders and actions

These pages are guidance, not mandatory list. They remind you, by danger label, of:

Hazard characteristics (e.g. flammable, toxic, corrosive, water-reactive)
Personal protective measures relevant to the hazard
Additional actions appropriate to that class

You're not expected to memorise every line. You are expected to know where to look.

Page 4 — Equipment for general and personal protection

This page is mandatory. It lists the equipment that must be on the vehicle. Your pre-departure check is, in part, a check of the cab and lockers against this page.

Always required (transport unit):

1 wheel chock per vehicle, suited to the size and weight (so 2 chocks for an artic or drawbar combination)
2 self-standing warning signs (reflective triangles or cones)
Eye-rinsing liquid (not required for some explosives or gas-only loads — see specifics)

Always required per crew member:

Hi-vis warning vest
Pocket lamp (torch). ATEX-rated if the load involves flammable gas/vapour atmosphere. Standard torch is not adequate for flammable atmospheres.
Protective gloves
Eye protection

Required for danger labels 3, 4.1, 4.3, 8, 9:

Drain seal (heavy plastic sheeting / commercial drain cover / absorbent "sausage" — UK enforcement accepts any of these)
Shovel (plastic preferred; upturned sides ideal)
Collecting container / bucket (capable of holding the substance without softening or being damaged)

Required for some specific gas/toxic loads:

Emergency escape mask (when IIW specifies — typically Class 2.3 toxic gases, Class 6.1 inhalation hazards)

Where do you store it all?

Cab: small extinguisher (2kg), hi-vis vest, gloves, eye protection, torch, IIW, transport document
Cab or locker: warning signs, eye-rinse, ATEX torch
External locker: large extinguishers, drain seal, shovel, bucket, additional PPE
Storage must be accessible to crew, protected from weather, organised so you can find what you need under pressure.

6. The vehicle — equipment check and approval

The general walkaround applies in full. ADR adds specific items.

Fire extinguisher minimums (per transport unit, full ADR carriage):

Vehicle ≤ 3.5t: total 4kg minimum (commonly 2 × 2kg)
Vehicle 3.5-7.5t: total 8kg minimum, of which one ≥ 6kg
Vehicle > 7.5t: total 12kg minimum, of which one ≥ 6kg, plus 2kg cab unit

A typical HGV transport unit carries 2kg cab + 6kg + 6kg = 14kg (2kg over the minimum, common in industry).

For each extinguisher, verify:

CE/UKCA mark present
Seal intact (verifies it has not been used)
Pin in place
Date of next inspection legible and not in the past
Accessible — not buried under a tarp, blocked by ratchet straps, or behind frozen lockers
Protected from weather — outside-mounted units in proper covers
Pressure gauge in the green (where fitted)

This is the single most-failed item at ADR roadside checks. Industry data suggests around 55% of ADR roadside encounters identify extinguisher issues. Yours doesn't have to be one of them — three minutes of inspection at the start of the shift is all it takes.

Other equipment to check pre-departure:

Wheel chocks present and serviceable
Warning signs complete and self-standing
Eye-rinse in date, container intact, easy to open
PPE — vest in usable condition, gloves not torn, eye protection clean and undamaged
Pocket lamp — working, batteries fresh, ATEX-rated if required
Spill kit items (drain seal, shovel, bucket) for danger labels 3, 4.1, 4.3, 8, 9
Class-specific items per IIW

Vehicle approval (VTG15).

If you're driving an EX/II, EX/III, FL, AT, OX, or MEMU vehicle, the vehicle should have a current VTG15 ADR approval certificate. Check it's present and not expired.

If you're driving a standard rigid or artic with packaged DG below tanker thresholds, no special vehicle approval is needed — you're operating a normal HGV that happens to be carrying ADR goods.

7. Placards and orange plates

The placards and orange plates are how the world knows what you're carrying. They matter at the roadside, in tunnels, and most of all to emergency services if something goes wrong.

Orange plates (front and rear of transport unit):

Plain orange rectangle for packaged DG carriage — this signals "this vehicle is carrying dangerous goods" without specifying which.
Numbered orange plate (split — top half hazard ID number, bottom half UN number) for tank carriage and bulk carriage. The HIN (Hazard Identification Number) on top tells emergency services the headline hazards (e.g. 33 = highly flammable liquid; X-prefix = water-reactive — do not use water).

Side placards (large class diamonds):

Required on tanks (all four sides) and on vehicles carrying packages of certain classes in larger quantities, and on bulk vehicles
The placard is a 250mm minimum class diamond
Same designs as the smaller class labels on packages
Mixed loads typically show all classes carried

On packages (you don't apply these — the consignor does — but you should verify):

Class diamond label
UN number
Proper Shipping Name
Subsidiary hazard labels where applicable
LQ or EQ markings where applicable

When you're not carrying DG:

Placards must be removed or covered. A vehicle showing "Class 3 flammable" markings while empty is itself a roadside-enforcement issue.
Orange plates should be removed or covered.
Magnetic placards / covered fixed placards make this practical.

Empty uncleaned tanks: still treated as carrying DG. Placards stay until tank cleaned and certified. Tank cleaning has specific criteria (15-minute fire engulfment for some hazards, full degas for flammable atmospheres).

8. Tunnel restriction codes — routing your job

Tunnel restriction codes control which dangerous goods can pass through which tunnels. Get this wrong and you risk a serious incident in a confined space, plus criminal prosecution.

Tunnel categories (the tunnel itself, A through E):

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

(B is most restrictive, E is least. Easy way to remember: alphabetically "E" comes after "D, C, B" — and the further letter you can use, the less restricted.)

UK tunnel categorisations (verify against current gov.uk list):

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

Plus 6 others. Always check before routing — categorisation can change.

Eurotunnel has its own (more restrictive) policy, separate from ADR categories. Check the Eurotunnel dangerous goods conditions before any cross-Channel work.

Goods restriction codes (assigned per UN number, found in transport document and ADR Chapter 3.2 column 15):

(B), (B/D), (B/E): strictest — many bulk/tank loads
(C), (C/D), (C/E): intermediate
(D), (D/E): common — many flammables
(E): least restrictive
(—): no tunnel restriction

The format "X/Y": the first letter applies to bulk/tank carriage, the second to packaged. So (D/E) means: forbidden from D and E tunnels in bulk/tank, forbidden from E tunnels in packages.

Mixed loads: the most restrictive code in the load applies to the entire load. You don't pick and choose by package.

Practical routing.

Modern HGV satnav often includes tunnel category data — but verify independently using gov.uk before relying on it
Routing around restricted tunnels can add significant time to a journey — factor into hours
LQ and EQ goods are not subject to tunnel restrictions — partial relief
Some tunnels (notably the Mersey) have escort requirements for certain load profiles. Local byelaws apply — operators handling Mersey-bound DG should know the procedure.

Wrong tunnel, wrong load:

At best: an offence and a prohibition.
At worst: catastrophic incident in a confined space with multiple fatalities (Mont Blanc 1999, Gotthard 2001, Tauern 1999 are the historical reference points).

When in doubt, route around. The extra hour is always worth it.

9. Loading, unloading, and segregation

Pre-loading inspection:

Vehicle bed clean, no incompatible residues from previous loads
Equipment serviceable (lashings, anchorage, headboard)
Placards correct or covered (loads may add placards, then need to be uncovered)
Pre-departure equipment check (extinguishers, IIW, transport doc)
For tank work: tank manhole closed and sealed, valves correct position, discharge equipment isolated

During loading:

Watch the load go on (or inspect on completion if site rules exclude drivers from the loading area)
Verify packages are in good condition — no leaks, no damage, no sweating, no swelling, no obvious deformity
Verify labels are correct and legible
Verify UN numbers and Proper Shipping Names match the transport document
Verify quantities match the transport document
Watch for signs of incompatible loading (e.g. flammable liquid being added to a tanker that previously carried oxidiser without cleaning)

Segregation.

Some classes cannot be loaded together. Common examples:

Class 1 (explosives) typically segregated from most other classes
Class 5.1 (oxidisers) segregated from Class 3 (flammables) in some packing groups
Class 8 acids segregated from Class 8 bases (acid + base = exothermic reaction)
Class 4.3 (water-reactive) segregated from anything containing water

The ADR segregation table (Table 7.5.2.1) is the reference. Your DGSA's job is to ensure your operator's procedures handle segregation correctly. Your job is to refuse any load that obviously violates segregation (e.g. you're being asked to load a Class 5.1 next to a Class 3 with no separation).

If you don't know whether two products can travel together, ask. The consignor knows. The DGSA knows. Don't guess.

Securing.

Same general standards as general haulage:

0.8g forward, 0.5g sideways, 0.5g rearward
Lashings to BS EN 12195-2 (webbing) or BS EN 12195-3 (chain)
Headboard sound, anchorage rated
Stable without lashings (the test)

Plus class-specific stowage requirements (Class 7 distance from regularly occupied positions, Class 1 stowage rules, etc.) — your training covers these per class.

Unloading.

Driver typically remains present (or accessible) during unloading
Follow site procedure (where to stand, PPE expectations, witness/marshall present)
Empty uncleaned packaging and empty uncleaned tanks remain regulated — placards stay, IIW stays, until cleaned/decontaminated
For tank work, follow specific discharge procedures — earthing, vapour management, pump priming where applicable

Site-specific rules.

Many ADR receivers (chemical sites, fuel terminals, hospital waste sites, ammunition stores) have their own dangerous-goods regimes. Site induction is common — sometimes annual. Specific PPE may be required beyond ADR baseline. Specific signed-in/signed-out procedures, dock allocations, banksman/marshall protocols.

10. The 2025 changes you should know about

ADR 2025 came into force 1 January 2025; the standard 6-month transition ended 30 June 2025. As a driver in May 2026, the changes below are settled rules. The headlines that affect drivers:

Transport document in the cab (from July 2025).

The transport document for every consignment must be in the driver's cab. Previously, common practice was for documents to ride attached to packages, with the driver having a delivery note as their proof. ADR has clarified this. Expect roadside checks to ask for the transport document in the cab as standard.

Limited Quantity drivers need training (ADR 8.2.3 clarified).

If you regularly carry DG in Limited Quantities, you now need ADR Driver Training Certification. Previously, LQ drivers often operated without a full ADR card. If your work is LQ-only and you haven't been trained, talk to your operator.

Sodium-ion batteries — UN 3551 to UN 3558.

New UN numbers covering sodium-ion batteries (cells alone, in equipment, vehicle-mounted). The "lithium battery mark" has been renamed the "battery mark" to cover both lithium and sodium-ion. The Class 9 hazard label is now 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

QR-code-based Tremcards.

Some industry communications mention QR-code Tremcards (digital emergency cards). These are accepted as supplementary to the standard 4-page IIW. The standard 4-page UNECE IIW remains mandatory in printed form in the cab. Don't be talked into accepting a QR-code-only solution.

Spill kit clarification for Class 3.

Industry guidance has flagged ADR 2025 clarifying mandatory spill kit requirements for Class 3 flammable liquid carriage. If you carry Class 3 and your vehicle's spill kit is patchy or missing items, raise it.

Equipment refresh. Industry guidance has urged a general equipment refresh in 2025 for fire extinguishers, gloves, wheel chocks, ATEX torches, and absorbents. Many operators completed this refresh in late 2024 / early 2025; a residual issue is checking your equipment was actually replaced rather than just claimed to be.

Fire extinguisher capacity ratios. Some industry sources reference revised volume ratios for ADR 2025. The base minimums (4kg ≤3.5t, 8kg 3.5-7.5t with one ≥6kg, 12kg >7.5t with one ≥6kg) remain the published headline. Specific class-additional refinements may apply to some load profiles. Verify against current ADR 8.1.4 text or check with your DGSA.

11. At a roadside ADR check

ADR roadside checks are typically more intensive than general haulage stops. DVSA conducts the check; in some cases HSE inspectors may attend.

The likely sequence:

Direction to a check site — same as general roadside checks
Initial conversation — where, what, who for, plus ADR-specific: which classes are you carrying, do you know the UN numbers, what's the headline hazard
Document check — driving licence, DQC, ADR Driver Training Certificate, tacho card, transport document, IIW, vehicle approval (where applicable)
Equipment check — fire extinguishers (capacity, seal, date), warning signs, eye-rinse, PPE, drain seal, shovel, bucket where required
Vehicle check — placards, orange plates, tank seals if applicable, electrical isolation if FL, body construction items
Load check — segregation, package integrity, labels, tunnel restriction code on transport document
Driver competence questions — what are you carrying, what's the headline hazard, what would you do in a fire / spill / collision

Driver competence questions are common. Examiners often ask drivers to describe (in their own words):

The UN numbers / proper shipping names of what they're carrying
The principal hazard class
The actions on Page 1 of the IIW
The location of the fire extinguishers
The tunnel restriction code on the transport document

Be prepared. You don't need to recite ADR chapter and verse — you need to demonstrate that you've informed yourself of the load (ADR 5.4.3.2), know where the kit is, and could act in an emergency.

Outcomes:

Clear encounter — go on. Goes positively on operator's record.
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 — for serious or repeated breaches under CDG 2009
Referral to Traffic Commissioner

The five rules (same as general haulage):

Co-operate fully. Powers are real. Obstruction is itself an offence.
Be honest. They'll find out.
Be polite. Not their friend, not their enemy.
Don't volunteer beyond what's asked.
Take notes — examiner name, time, what was checked, what was said.

If a finding is wrong: say so calmly, once. Don't argue. Appeal is the proper route, not roadside debate.

12. Incident response — the day it happens

For most ADR drivers, real incidents are rare. You may go years without one. That's exactly why the procedures matter — when it happens, you'll be working from training and routine, not improvising.

The IIW Page 1 actions, in order

1. Stop. Brake. Engine off. Isolate batteries (where the vehicle has a battery isolation switch).

This stops the vehicle producing additional energy / heat / sparks. Apply the parking brake. Don't leave it in gear running.

2. Avoid sources of ignition.

No smoking, no flames, no electrical activation (radios, mobile phones can be ignition sources in flammable atmospheres — yes, your phone). Move away from the vehicle if you suspect a leak with flammable atmosphere.

3. Inform emergency services.

999 / 112. Tell them:

Your location (road number, junction number, what3words if you have it, mile marker, nearest landmark)
Type of vehicle (HGV, tanker, etc.)
What you're carrying (UN number, Proper Shipping Name, class — your transport document will have all this)
What's happened (collision, fire, spill, leak, smoke)
Number of people involved (you, crew, other vehicles)
What you've done so far

4. Don warning vest. Place self-standing warning signs.

Front and rear of the incident, at appropriate distance (longer distances on motorways and at speed). The vest makes you visible to other traffic; the signs prevent secondary collisions.

5. Keep transport documents accessible.

The IIW and transport document should be available for emergency services on arrival. They tell first responders what they're dealing with.

6. Keep the public away.

Don't let curious onlookers approach. If the incident is in a built-up area, urge people to move away and stay upwind of any leak.

7. Tackle minor incipient fires only.

Your fire extinguisher is for engine/cab fires and very early-stage fire suppression. A fire that's involving the load is beyond the scope of a 6kg dry powder extinguisher and beyond the scope of your training. Move away and let the fire and rescue service deal with it.

8. Evacuate the area in the event of significant release.

Toxic gas leak (Class 2.3) or significant flammable vapour release: get away. Upwind, uphill if possible, and far enough that you're not in the affected zone. Do this before calling emergency services if you can — your safety first, then call.

9. Provide information to first responders.

Hand them the IIW and transport document. Tell them what happened, in clear short sentences. They'll then take over the incident.

10. Contact your operator.

Once safe and emergency services are responding, call the office. They'll notify the DGSA, insurance, customer.

What you don't do

Don't be a hero. ADR doesn't expect drivers to be quasi-emergency responders. Your job is to make the situation safer until specialists arrive — not to solve it.
Don't move the vehicle unless it's safe and necessary. Moving a damaged vehicle can spread a leak or cause secondary incident.
Don't admit liability at the scene — to other drivers, to police, or to anyone. Stick to what happened.
Don't speak to media. If asked, refer them to your operator.
Don't dispose of evidence. The vehicle, the load, the documentation, your written notes — all may be relevant to investigation.

After the incident

Note everything you can remember, in writing, while it's fresh: timeline, sequence of events, what you saw, what you said, what others said.
Co-operate with investigations — police, HSE, insurance, customer, DGSA, your operator.
Talk to someone about what happened. ADR incidents can be traumatic. Mates in Mind, Samaritans, your GP, your union — see Section 13.

13. Personal welfare in ADR work

Fatigue (everything in the General Driver guide applies, plus)

ADR work often involves longer turnaround times at sites (loading checks, unloading procedures, induction, paperwork). The hours feel longer than the tacho says, and sometimes they are — site time can extend beyond what was planned. Push back if you're being asked to push past a sensible operating window. The tacho doesn't measure how much your concentration is left.

Mental health

The transport industry has higher than average rates of stress, depression, and suicide. ADR work adds:

Higher consequence pressure — you know what happens if something goes wrong
Site isolation — many ADR sites are remote, secured, low-population; long hours in the cab between contacts
Awareness of risk — carrying loads where, if things went wrong, the consequences are publicly catastrophic
Post-incident effects — even a near-miss can stay with a driver for months or years

You're not alone. Industry-wide, this is recognised. Resources:

Mates in Mind — matesinmind.org. Mental health charity for construction and transport. Free, confidential, sector-specific.
Andy's Man Club — andysmanclub.co.uk. Free peer-led men's mental health groups, UK + online, Mondays 7pm.
Samaritans — 116 123. 24/7. Anyone can call.
GP — first port of call for medical/clinical support.
Your operator's EAP — if there is one; ask the office.
Your union — if you're a member, welfare resources will be available.

Post-incident

If you've been involved in an ADR incident — even one that turned out fine — talk to someone. Don't let it sit. The drivers who fare best after incidents are the ones who process what happened, not the ones who tough it out alone.

Medical conditions and DVLA

Same as general haulage — you have a duty to inform DVLA of conditions that may affect fitness to drive. Heart, diabetes, epilepsy, sleep apnoea, certain mental health, vision changes. Hidden conditions end careers; declared and managed conditions usually don't.

ADR-specific concerns:

Eye conditions — colour vision matters for placard/marking recognition, particularly for Class 1 explosives operations
Skin sensitivity — some drivers develop sensitivity to dry powder extinguisher residue, certain chemical exposures. PPE matters, not just for major incidents but for routine cumulative exposure.
Stress / anxiety — common in incident-experienced drivers. Treatment is available; managed conditions are usually compatible with continued driving.

Site-specific exposures

Some ADR work involves repeated exposure to substances that have long-term health implications even at low levels (some Class 6.1 toxics, some Class 8 corrosives, certain Class 4.2 dust hazards). Site PPE and procedures address acute risk; long-term cumulative exposure depends on doing the basics consistently every shift — gloves on, eye protection on, hands washed before eating.

14. 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

ADR 2025 (UNECE) — unece.org/transport/dangerous-goods/adr-2025
CDG 2009 Regulations — legislation.gov.uk
HSE Manual for the Carriage of Dangerous Goods by Road — hse.gov.uk/cdg
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
UNECE IIW translations (22 languages) — unece.org/transport/road-transport/linguistic-versions-adr-instructions-writing

Driver training and certification

SQA — sqa.org.uk (ADR Driver Training Certificate)
DfT-approved training providers — published list at gov.uk

Driver wellbeing

Mates in Mind — matesinmind.org
Andy's Man Club — andysmanclub.co.uk
Samaritans — 116 123, samaritans.org
Mind — mind.org.uk
DVLA medical conditions — gov.uk/health-conditions-and-driving

Industry

Chemical Business Association — chemical.org.uk
British Compressed Gases Association (Class 2) — bcga.co.uk
DGSA Network and ADR training providers (multiple)

Class 7 (radioactive)

ONR — onr.org.uk
Society for Radiological Protection — srp-uk.org

Specialist legal advice

Transport regulatory solicitors — for serious matters seek named expertise
Environmental regulatory solicitors — for spill/release prosecution

A final word

ADR work is a deeper version of general haulage. The fundamentals you do every day — walkaround, hours, load security — still apply. ADR adds documentation, equipment, training, placarding, routing discipline, and a more demanding incident-response responsibility.

Most days, this is just routine. The card in the wallet, the IIW in the dash, the kit in the locker, the placards visible on the trailer, the tunnel-restriction code on the transport document. Done properly, ADR work is no harder than general haulage — it's just more.

Most ADR drivers go a whole career without a serious incident. The minority who don't — the ones who deal with a real one — almost always say afterwards that they were grateful for the training and the routine. The kit was where it should be. The procedure had been drilled. They stopped, isolated, called, and waited for the specialists.

That's the version of yourself you're preparing for, every shift you do this work. Worth doing properly.

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 your DGSA's guidance, and seek specialist advice for your specific circumstances.