ADR is the regulatory framework that governs the carriage of dangerous goods by road. Its purpose is to reduce risk to people, property and the environment by setting clear requirements for how hazardous substances are transported.
This page explains what ADR regulations are, what they apply to, and how they affect vehicles and operators involved in the carriage of dangerous goods.
What ADR is
ADR is the European Agreement concerning the International Carriage of Dangerous Goods by Road. It is adopted into UK law and applies to the transport of dangerous goods on public roads.
ADR establishes a common system for:
- Classifying dangerous goods
- Specifying approved packaging and containment
- Defining marking, labelling and placarding requirements
- Setting vehicle equipment and safety provisions
- Requiring appropriate documentation and driver training
The regulations are designed to ensure that dangerous goods are identified correctly and managed consistently throughout the transport process.
What ADR applies to
ADR applies to the carriage of dangerous goods themselves, rather than to the commercial purpose of the journey or the type of operator involved.
Depending on the substance and quantity carried, ADR may impose requirements on:
- The classification of the goods into ADR hazard classes
- The type of packaging or containment used
- The hazard labels and markings displayed
- The use of orange plates or placards
- Vehicle safety equipment and electrical systems
- Driver certification and transport documentation
Not all dangerous goods movements are subject to the same level of control. ADR includes exemptions and thresholds that determine when full compliance is required.
ADR and vehicles
ADR does not define vehicle categories in the same way as type approval or construction regulations. Instead, it sets out additional requirements that apply when a vehicle is used to carry dangerous goods.
For most dry freight vehicles, ADR compliance relates to safety systems and equipment rather than to the load-carrying structure of the vehicle.
Specialist vehicles, such as tankers, are subject to more extensive ADR construction and approval requirements due to the nature of the loads they carry.
ADR hazard classes and identification
Dangerous goods are divided into ADR hazard classes based on the type of risk they present, such as flammability, toxicity or corrosiveness.
These classes determine the hazard labels, markings and documentation required during transport. They identify the nature of the hazard, not the quantity of goods being carried.
Correct classification and identification are central to ADR compliance and enable emergency services and operators to understand the risks involved.
View supporting guidance and related resources
Frequently asked questions about ADR
Does ADR apply to all dangerous goods?
No. ADR includes exemptions and quantity thresholds. Some dangerous goods movements fall outside full ADR requirements depending on the substance, packaging and quantity carried.
Does ADR affect vehicle payload?
No. ADR regulates the classification, packaging, identification and safe transport of dangerous goods. Vehicle payload is governed separately by vehicle design and weight regulations.
Are ADR requirements the same for dry freight vehicles and tankers?
No. Tankers are subject to specific ADR construction and approval requirements. Dry freight vehicles are typically affected by safety equipment, markings and operational controls.
