What is Packing Group?
Packing Group I, II or III indicates high, medium or low danger for substances to which ADR assigns such a group.
Great Britain applies ADR through the Carriage of Dangerous Goods Regulations. Classification, packaging, marking, documents, vehicle equipment and training must match the actual substance, quantity and mode of carriage.
| Aspect | What to know |
|---|---|
| Core meaning | Groups I, II and III |
| Operational use | Indicates degree of danger |
| Control point | Not assigned to every substance |
| Key caution | Affects packaging standard |
How does it work in practice?
The consignor combines the group with the packing instruction to select tested packaging of the required performance level.
Before loading, the consignor and carrier verify the UN number, proper shipping name, class, packing group, quantities, exemptions and transport document. Vehicle and crew requirements are then checked against the real load.
Decisions, exceptions and reference numbers should be recorded in the transport order or relevant system. This creates a clear audit trail of the information available and the actions taken by each party.
Key points to check
- Groups I, II and III
- Indicates degree of danger
- Not assigned to every substance
- Affects packaging standard
Always check current contract terms and official guidance as the correct application may vary by vehicle, goods, route, port, customer role or selected customs procedure.
Why does it matter for urgent transport?
Dangerous goods must never be treated as ordinary freight merely because delivery is urgent. Complete classification and compatible equipment are required before a vehicle is assigned.
Good preparation prevents a fast vehicle movement from being delayed by missing documents, unsuitable equipment, incorrect classification or denied access at the collection, border or delivery point.
Frequently asked questions
What is Packing Group used for?
Packing Group I, II or III indicates high, medium or low danger for substances to which ADR assigns such a group. The consignor combines the group with the packing instruction to select tested packaging of the required performance level.
Is Packing Group mandatory?
Application depends on the substance, quantity, packaging and available exemptions. ADR 2025 and current HSE guidance are authoritative.
What should be checked before transport?
Confirm the parties, goods, documents, reference validity and requirements along the actual route. Where the rule is regulatory, use the latest guidance from the competent UK authority.
Sources: HSE – Carriage of dangerous goods and GOV.UK – Moving dangerous goods. Editorial review: 13 August 2026.