For the purposes of Article2 of ADR, Annex A specifies:

(a)Dangerousgoods which are barred from international carriage;

(b)Dangerousgoods which are authorized for international carriage and the conditions attaching to them (including exemptions) particularly with regard to:

-classification of goods, including classification criteria and relevant test methods;

-use of packagings (including mixed packing);

-use of tanks (including filling);

-consignment procedures (including marking and labelling of packages and placarding and marking of means of transport as well as documentation and information required);

-provisions concerning the construction, testing and approval of packagings and tanks;

-use of means of transport (including loading, mixed loading and unloading).

Annex A contains certain provisions which, according to Article 2 of ADR, pertain to AnnexB or to both Annexes A and B, as follows:

1.1.1 Structure

1.1.2.3 (Scope of Annex B)

1.1.2.4

1.1.3.1 Exemptions related to the nature of the transport operation

1.1.3.6 Exemptions related to quantities carried per transport unit

1.1.4 Applicability of other regulations

1.1.4.5 Carriage other than by road

Chapter 1.2 Definitions and units of measurements

Chapter 1.3 Training of persons involved in the carriage of dangerous goods

Chapter 1.4 Safety obligations of the participants

Chapter 1.5 Derogations

Chapter 1.6 Transitional measures

Chapter 1.8 Checks and othersupport measures to ensure compliance with safety requirements

Chapter 1.9 Transport restrictions by the competent authorities

Chapter 1.10 Security provisions

Chapter 3.1 General

Chapter 3.2 Columns(1), (2), (14), (15) and (19) (application of provisions of Parts 8 and 9 to individual substances or articles).

1.1.2.3    For the purposes of Article 2 of ADR, Annex B specifies the conditions regarding the construction, equipment and operation of vehicles carrying dangerous goods authorized for carriage:

-    requirements for vehicle crews, equipment, operation and documentation;

-    requirements concerning the construction and approval of vehicles.
 

In Article 1(c) of ADR, the word "vehicles" need not refer to one and the same vehicle. An international transport operation may be performed by several different vehicles provided that the operation takes place on the territory of at least two Contracting Parties to ADR between  the consignor and the consignee indicated in the transport document.

The provisions laid down in ADR do not apply to the carriage of:

(a)    Gases contained in the fuel tanks or cylinders of a vehicle performing a transport operation and destined for its propulsion or for the operation of any of its equipment used or intended for use during carriage (e.g. refrigerating equipment).

The gases may be carried in fixed fuel tanks or cylinders, directly connected to the vehicle’s engine and/or auxiliary equipment or transportable pressure receptacles, which comply with   the pertinent legal provisions.

The total capacity of the fuel tanks or cylinders for a transport unit, including those allowed in accordance with 1.1.3.3 (a), shall not exceed the amount of energy (MJ) or mass (kg) corresponding to 54 000 MJ energy-equivalent.

NOTE 1:       The value of 54 000 MJ energy-equivalent corresponds to the fuel limit of 1.1.3.3
(a)    (1500 litres). For the energy content of fuels see the following Table:

The total capacity shall not exceed:
-    1 080 kg for LNG and CNG;
-    2 250 litres for LPG;

NOTE 2:       A container fitted with equipment for use during carriage, secured on a vehicle,  is considered as an integral part of the vehicle and benefits from the same exemptions as regards the fuel necessary to operate the equipment.

(b)    (Deleted)

(c)    Gases of Groups A and O (according to 2.2.2.1), if the pressure of the gas in the receptacle or tank at a temperature of 20 °C does not exceed 200 kPa (2 bar) and if the gas is not a liquefied or a refrigerated liquefied gas. This includes every kind of receptacle or tank, e.g. also parts of machinery and apparatus;

NOTE:    This exemption does not apply to lamps. For lamps see 1.1.3.10.

(d)    Gases contained in the equipment used for the operation of the vehicle (e.g. fire extinguishers), including in spare parts (e.g. inflated pneumatic tyres); this exemption also applies to inflated pneumatic tyres carried as a load;

(e)    Gases contained in the special equipment of vehicles and necessary for the operation of this special equipment during transport (cooling systems, fish-tanks, heaters, etc.) as well as spare receptacles for such equipment or uncleaned empty exchange receptacles, transported in the same transport unit;

(f)    Gases contained in foodstuffs (except UN 1950), including carbonated beverages; and

(g)    Gases contained in balls intended for use in sports.

(h)    (Deleted)
 

Certain special provisions of Chapter 3.3 exempt partially or totally the carriage of specific dangerous goods from the requirements of ADR. The exemption applies when the special provision is referred to in Column (6) of Table A of Chapter 3.2 against the dangerous goods entry concerned.

Certain dangerous goods may be subject to exemptions provided that the conditions of Chapter 3.4 are met.

Certain dangerous goods may be subject to exemptions provided that the conditions of Chapter 3.5 are met.