ADR transport in a partial system (LTL – Less Than Truckload) is a logistical process involving the carriage of dangerous goods alongside other cargo units on a single trailer. Executing such orders relies on restrictive guidelines contained in the international ADR Agreement, which precisely defines the rules for packing, marking, and securing chemical substances and flammable materials.
The primary challenge in the groupage model is safe consolidation—grouping various goods in a way that eliminates any risk of reaction between them in the event of a leak or packaging damage. A transport planner must demonstrate expert knowledge of transport chemistry and a perfect command of the mixed loading prohibition tables. Each transport unit must be prepared considering the specific hazard classes, requiring precise documentation verification as early as the route planning stage.
In this article, we detail the steps necessary for the correct execution of partial dangerous goods transport, from classification to technical vehicle requirements.
Classification of Dangerous Goods and UN Numbers
The foundation of safe consolidation in LTL transport is precise cargo identification. Every substance approved for trade must possess detailed documentation that allows the carrier to determine which other goods it can safely share a trailer with.
The ADR Agreement divides dangerous materials into 13 hazard classes, each assigned a graphic symbol (a diamond-shaped warning label). Correct class identification allows the planner to perform initial goods selection. For example, Class 4.1 materials (flammable solids) require entirely different neighboring conditions than Class 2 compressed gases.
The Significance of UN Numbers and Packing Groups
Division into classes alone is insufficient for safely consolidating partial loads.
- The UN Number is a four-digit identification code assigned to a specific substance or group of substances (e.g., UN 1263 for paints). It uniquely identifies the physicochemical properties of the goods.
- The Packing Group defines the degree of danger presented by the material:
- Group I: High danger substances.
- Group II: Medium danger substances.
- Group III: Low danger substances.
In groupage transport, information regarding the packing group is essential for calculating so-called point limits, which determine whether a transport must be marked with orange plates or can proceed under simplified rules.
Mixed Loading Rules and Consolidation Prohibitions
In LTL transport, the most critical planning element is verifying whether selected goods can be placed next to each other on one trailer. While dimensions and weight are the deciding factors for standard cargo, chemical properties are paramount in ADR transport. Improperly pairing products can lead to dangerous reactions such as spontaneous combustion, the release of toxic gases, or packaging corrosion of other shipments.
The Mixed Loading Prohibition Table
The primary tool for dispatchers and planners is the mixed loading prohibition table found in section 7.5.2 of the ADR Agreement. This matrix indicates which hazard classes are incompatible. The rule is simple: if an “X” appears at the intersection of two classes in the table, mixed loading of these goods on one transport unit is strictly prohibited.
The most restrictive regulations apply to Class 1 (explosives), which in the vast majority of cases may not be combined with any other dangerous goods. However, less obvious prohibitions also exist, such as combining certain oxidizing materials (Class 5.1) with flammable materials, which could drastically accelerate combustion if packaging leaks.
Cargo Separation Inside the Trailer
Even if the prohibition table allows for mixed carriage, good logistical practice and specific packing instructions require proper separation. Several methods are used in partial transport to protect cargo from mutual interference:
- Physical Distance: Placing ADR load units in different parts of the trailer (e.g., one at the front, another at the very rear), separated by neutral (non-ADR) goods.
- Physical Barriers: Using additional protection, such as partitions or pallet bracing, to prevent direct contact between packages if they shift.
- Sealing Principles: Liquid shipments should always be loaded in a manner that prevents them from spilling onto dry or absorbent goods below.
This process is supervised by a DGSA (Dangerous Goods Safety Adviser), who verifies the load list before every line-haul departure.
Point Limits and Limited Quantities (LQ)
Not every dangerous goods transport in a groupage system requires full vehicle marking and compliance with every ADR rigour. There are two key exemptions that allow for the carriage of smaller quantities of substances while maintaining high safety standards with reduced administrative and technical burdens.
Transport under “Points” (The 1.1.3.6 Rule)
This is one of the most frequently used exemptions in LTL transport. It allows for the carriage of dangerous goods without the need to display orange plates on the vehicle, provided the sum of “points” assigned to the load does not exceed 1000. Each substance has a multiplier based on its transport category:
- Category 1: Multiplier 50 (max. 20 kg/l).
- Category 2: Multiplier 3 (max. 333 kg/l).
- Category 3: Multiplier 1 (max. 1000 kg/l).
If the total points for all ADR shipments on the trailer equal, for example, 850, the driver does not need a full ADR license (job-specific training is sufficient), and the vehicle does not need orange plates.
Limited Quantities (LQ)
The Limited Quantity (LQ) exemption refers to the way the goods are packed. If a dangerous substance is packed in small inner receptacles (e.g., 1-liter cans or sprays) placed within certified outer packaging (cartons), the shipment is treated as posing a minimal hazard.
- The LQ mark is a characteristic white diamond with black corners.
- Transporting in this mode exempts the carrier from most ADR requirements, including the ADR transport document and specialized vehicle equipment.
- The only condition is that the total gross mass of LQ shipments on the transport unit must not exceed 8 tons; above this limit, the vehicle must be marked accordingly.
Documentation and Information Obligations
In dangerous goods transport, documentation serves not only for record-keeping but primarily for information. In an emergency or during a road inspection, precise data about the load allows emergency services to take the correct actions.
Correct Issuance of the ADR Transport Document
Every ADR shipment must be accompanied by a transport document containing information in a strictly defined order:
- UN Number (e.g., UN 1203).
- Proper Shipping Name (e.g., GASOLINE).
- Hazard Label Models (e.g., 3).
- Packing Group (if assigned, e.g., II).
- Tunnel Restriction Code in parentheses (e.g., D/E).
For groupage transport, the document must also specify the number and description of packages and the total quantity of each dangerous good (volume or net mass).
Written Instructions for the Driver
In addition to the cargo documents, the vehicle cabin must contain written instructions consistent with the ADR Agreement model. This standardized document outlines procedures in case of an accident or emergency. These instructions must be provided in a language (or languages) understood by the driver and crew.
Summary: Cargo Consolidation in ADR LTL Transport
Executing ADR transport in an LTL system requires a tight integration of advanced logistics and rigorous chemical safety standards. Consolidating dangerous goods is not just a matter of space optimization, but primarily of risk management. Success lies in precise substance classification, scrupulous adherence to mixed loading prohibitions, and the proper use of exemptions like point limits or Limited Quantities (LQ).
Professional ADR Service with Jasek Transport
Jasek Transport is a partner that prioritizes full transparency and direct supervision at every stage of the order. By choosing our services, you can be sure that even the smallest ADR shipment is treated with the highest attention. We ensure a smooth flow of information and safety, which is the paramount value in the transport of sensitive goods.
