The transport of dangerous goods by road under ADR (European Agreement concerning the International Carriage of Dangerous Goods by Road) involves rigorous controls to ensure safety in the event that several classes of goods travel together. The key is to correctly calculate the permitted quantity limit and the combination of different classes of goods in a single vehicle. Here we explain how to do this in a simple way.
1. Classification of dangerous goods
First, it is essential to know the class of each dangerous good you are transporting. The ADR classifies dangerous goods into 9 main classes, depending on their nature, such as explosives (Class 1), gases (Class 2), flammable liquids (Class 3), among others.
2. Compatibility table
Not all classes of dangerous goods can travel together. The ADR compatibility table specifies which classes can be carried in the same vehicle. For example, Class 3 goods (flammable liquids) must not be carried together with Class 1 goods (explosives), unless special provisions allow this.
3. Calculation of the total quantity permitted
Once the classes of goods and their compatibility have been identified, the next step is to calculate the quantity limit for each product. According to the ADR, there are loading thresholds that must not be exceeded, especially for ‘limited quantity’ or ‘excepted quantity’ consignments. The total sum of dangerous goods carried in a vehicle must not exceed 1,000 points, according to the ADR calculation method.
Example of calculation:
- For Class 3 goods (flammable liquids), with a coefficient of 3. If you are carrying 300 litres, the calculation would be:
300litresx3=900points300 litres x 3 = 900 points300litresx3=900points - If you wish to add Class 8 goods (corrosives), with a coefficient of 2, and you transport 50 litres:
50litresx2=100points50 litres x 2 = 100 points50litresx2=100points
When you add up the points (900 + 100 = 1000), you would be within the permitted limit for the joint transport of these dangerous goods.
4. Automatic calculation tools
Today, there are online ADR calculators that allow you to enter your cargo-specific data to automatically calculate whether you comply with the limits set by the regulations. We recommend that you always check the most recent ADR update and use these tools to ensure safety and compliance.
5. Documentation and labelling
It is essential to carry the correct documentation, specifying the classes of goods being transported, the quantities and the identification number of each product. In addition, the vehicle must be properly labelled according to the type of goods, including orange hazard placards.
Calculating the limit quantity of dangerous goods to be transported in a single vehicle is a task that requires precision, knowledge of current regulations and the right tools. Complying with these regulations ensures the safety of your operations and avoids penalties.
If you would like more information about dangerous goods transport or any of our services, please do not hesitate to contact us.