ADR Classes and ADR Transport
blog 22/11/2024

ADR Classes and ADR Transport

As a carrier, we transport all kinds of goods. In most cases, these are simple pallets loaded with customers’ products. These might be soft teddy bears, but not all goods are so safe and innocent. Certain types of goods carry risks. Examples include flammable products, explosive hazards, or chemical substances. These goods may not be transported without proper precautions. To keep the environment safe, you must deal with ADR Classes. You can read more about these ADR Classes in this blog!

ADR Meaning

ADR is the abbreviation for Accord relatif au transport international de marchandises Dangereuses par Route. If you don’t speak French: simply put, this means the transport of dangerous goods. ADR is the European treaty consisting of agreements and regulations. It is a classification regarding the transport of dangerous goods and substances by road.

ADR Rules

The ADR set of rules was compiled by the United Nations. These rules establish everything related to the transport of dangerous goods. For instance, there are rules on how substances must be transported, which markings are required on the truck, and which substances may be transported through which tunnels. The full set of rules can be found on the UNECE website.


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ADR Classes and Stickers

There are 9 ADR classes in total, with classes 2, 4, 5, and 6 further divided into multiple hazard classes. The description of these ADR classes and hazard classes can be found below:


Class 1: Explosive substances and articles

This class mainly includes items such as fireworks, weapons, and ammunition. The primary danger is the risk of explosion. Class 1 is identifiable by a label. When explosive goods are being transported, they can be recognized by the following label:

ADR class 1

Class 2: Gases

Class 2 concerns various types of gases. The main hazards are flammability, asphyxiation, corrosive substances, and toxic substances.

Class 2.1 Flammable gas

Gases that are flammable fall under class 2.1. You can recognize them by the red sign with a flame.

ADR class 2.1

Class 2.2 Non-flammable, non-toxic gas

Class 2.2 indicates gases that are neither flammable nor toxic. This is indicated by a green label with a gas cylinder on it:

ADR Class 2.2

Class 2.3 Toxic gas

Toxic gas also has its own subclass, namely ADR class 2.3. This is indicated by the skull and crossbones on a white sign.

ADR class 2.3

Class 3: Flammable liquids

Class 3 contains liquids that can ignite under specific conditions. Flammability is therefore the main risk. The label below indicates these flammable liquids:

ADR class 3

Class 4: Flammable solids

Like class 3, ADR class 4 classifies flammable substances. In this case, it concerns flammable solids. Class 4 is subdivided into three hazard classes:


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Class 4.1: Flammable solids

Solids that ignite easily (due to friction). Substances in granular, powder, metal, or paste form. You can recognize these by the red and white striped label:

ADR class 4.1

Class 4.2: Substances liable to spontaneous combustion

These are substances that can ignite upon contact with oxygen in the air without an ignition source. These can be recognized by the red-white label:

ADR class 4.2

Class 4.3: Substances which emit flammable gases in contact with water

Class 4.3 contains substances that develop flammable gases when in contact with water. The danger of gas formation and explosion is therefore present. You can recognize them by the blue label:

ADR class 4.3

Class 5: Oxidizing substances

Class 5 contains oxidizing substances. This means these substances release oxygen, which can cause combustion in other substances. The substances themselves do not necessarily have to be flammable. Class 5 is also further subdivided into two hazard classes:

Class 5.1: Oxidizing substances

These are substances that are not flammable themselves but can cause the combustion of other substances. These substances have the following yellow label:

ADR class 5.1

Class 5.2: Organic Peroxides

Organic peroxides are chemically unstable substances that can decompose themselves. They are mainly used as auxiliary materials for plastics. The substances can be corrosive and/or flammable. You can recognize them by the following label:

ADR class 5.2

Class 6: Toxic substances

Toxic substances also have their own ADR class. This is further subdivided into classes 6.1 and 6.2.

Class 6.1: Toxic substances

Toxic substances refer to substances that harm human health or cause death upon inhalation, skin contact, or ingestion. These are recognized by the label with a skull and crossbones, identical to the label belonging to class 2.3.

ADR class 6

Class 6.2: Infectious substances

Class 6.2 classifies infectious substances that can cause disease in humans and/or animals. This also has a white label, recognizable by the logo you see in every sci-fi movie:

ADR class 6.2

Class 7: Radioactive substances

Class 7 includes substances with the property of spontaneously emitting energy in the form of invisible radiation, i.e., radioactive substances. You will also see this logo in movies from time to time. It indicates that goods are radioactive:

ADR Class 7

Class 8: Corrosive substances

Corrosive substances are chemical substances that attack the skin or mucous membranes, such as hydrochloric acid and sulfuric acid. Acids are recognized by the following label. It shows that a corrosive substance is being transported:

ADR class 8

Class 9: Miscellaneous dangerous substances and articles

Class 9 is essentially the “miscellaneous” category. This concerns substances that pose hazards during transport but do not fall under the description of any of the other classes.
These are given the following label:

ADR class 9

ADR Numbers

To indicate certain ADR classes and dangerous substances, we use various numbers in the industry. The most important ones can be found below.

Kemler Plate

The Kemler plate, also called a UN plate, is not really a number in itself, of course. This plate serves as a warning sign on trucks to indicate the dangerous substances being transported in the trailer. It is an orange plate, divided into two sections by a black line. The UN number is found in the bottom section. The top section is used to indicate the HIN (Hazard Identification Number) or Kemler Code.

Kemler plate

UN Number

A UN number is the classification number of a dangerous substance, also known as a substance identification number. It is a four-digit number that classifies the substance according to the guidelines established by the United Nations (UN).

The UN number is recognized worldwide and is even a requirement in most countries for the transport of dangerous goods. This number must be on the outside of the goods’ packaging and be clearly visible.


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A number of common dangerous goods and substances have their own UN number. All other types are assigned a UN number belonging to the overarching category they fall under. These latter numbers can be recognized by the mention of “N.O.S.” (not otherwise specified) after the number.

HIN Number

HIN stands for Hazard Identification Number (GEVI-nummer). While the UN number indicates which substance is being transported, the HIN shows which specific hazard is associated with it. The first digit in the number indicates the primary hazard. If the second digit is the same as the first, it means that the primary hazard is intensified.

EASY Road Transport and ADR Classes

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ADR Data on a CMR Consignment Note

When filling in ADR data on a CMR consignment note, it is important to include specific information about the dangerous substances. This includes the UN number, the proper shipping name, the label number, the packing group, and the tunnel code. Additionally, you must also state the quantity of dangerous goods and the names and addresses of the sender and recipient. The document must be drawn up in the official language of the sending country and in an international language (English, French, or German). This information must be legible and displayed in the correct order.

ADR Regulations During the Transport of Dangerous Goods

It is mandatory for vehicles exporting dangerous goods to have specific equipment. This is necessary to manage incidents. This includes fire extinguishers, such as a cab extinguisher of at least 2 kilograms of powder and additional extinguishing agents depending on the mass of the transport unit. Furthermore, equipment for general and personal protection must be present, including warning vests, eye protection, and escape masks for certain substances. For specific hazard labels, extra items such as a shovel and a collecting container are required. Some exceptions apply for transport under the 1000-point rule.

Exemptions from ADR Regulations During Transport

Within the ADR regulations, there are various exemptions for the transport of dangerous goods by road. Private individuals transporting dangerous goods for their own use are exempt, provided the substances are properly packaged and leakage is prevented. Companies may be exempt if the transport is ancillary to their main activities, such as transport for construction. Exemptions also apply to certain gases and liquid fuels, provided they meet specific conditions. Additionally, there are exemptions for limited quantities and under the 1000-point rule for packaged goods.