The recent introduction of the regulation has raised understandable questions across the logistics sectors.
The recent introduction of the regulation allowing certain articulated vehicle combinations to operate at up to 44 tonnes in Spain has raised understandable questions across the logistics and energy sectors. This is particularly true in fuel transport by road, where maximum authorised weight is not just a technical figure, but an operational and legal constraint.
Until 23 January, the general limit for articulated vehicles was 40 tonnes. Under the new framework, and depending on the technical specifications of the combination, that limit may increase to 44 tonnes, or in some cases 42 tonnes, always including the vehicle’s unladen weight.
The important point is that this is not a blanket increase for the entire fleet. And, crucially, what is theoretically permitted under the regulation does not automatically translate into approval in practice.
- What moving from 40 to 44 tonnes actually means
The Spanish MMA is the maximum weight a fully loaded vehicle is authorised to operate at. This includes the tractor unit, the tanker, the load itself, fuel and all integrated components.
While the regulation allows certain vehicle combinations to reach 44 tonnes, the actual possibility depends entirely on the technical data recorded in each vehicle’s registration documents.
Key parameters include:
- The authorised gross combination weight (F.3.1)
- Maximum permitted axle loads (F.1.1 and F.2.1)
- Axle configuration and number of axles
Depending on these factors, a vehicle combination may be able to operate at 44 tonnes, 42 tonnes, or may remain limited to 40 tonnes. There is no universal rule.
In fuel transport, this assessment is particularly important. We are dealing with products whose density varies (diesel, petrol, biofuels) which means the loaded volume must be carefully calculated to ensure that neither the overall weight nor the axle limits are exceeded.
However, even where the documentation suggests that 44 tonnes should be technically feasible, that does not mean the vehicle will automatically be authorised to operate at that weight.
- The practical reality: vehicle inspection, tanker age and braking performance
This is where the roadworthiness test authority (the ITV in Spain) becomes decisive.
In practice, especially with older tankers, inspection stations have been raising objections to increasing the authorised weight to 44 tonnes. The reason is straightforward and entirely legitimate: safety.
Adding an extra four tonnes to a vehicle combination is not a marginal adjustment. It increases the total mass significantly and has a direct impact on a critical factor (braking performance).
Even if the technical specifications indicate that 44 tonnes are theoretically possible, the inspection authority has the final say. If the vehicle cannot demonstrate sufficient braking efficiency for the higher authorised mass, approval will not be granted.
This has led to a mixed picture in the market:
- Some vehicle combinations are being approved for 44 tonnes without issue.
- Others, particularly those with older tankers, are not receiving authorisation.
- In certain cases, operators are remaining at 40 or 42 tonnes despite the regulatory change.
In short, the practical application of the 44-tonne limit depends not only on paperwork, but on the actual condition of the vehicle and its ability to meet safety standards.
- A regulatory change that requires case-by-case assessment
The extension of the authorised weight to 44 tonnes does not fundamentally alter the model of fuel transport by road. It does, however, introduce a new operating margin that requires proper technical review and planning.
For some operators, it may deliver efficiency gains. For others, inspection outcomes or fleet characteristics will limit the impact.
In any case, applying the regulation correctly means:
- Reviewing the technical documentation of each vehicle combination
- Verifying axle load limits
- Assessing real braking performance
- Securing formal approval through inspection
In a highly regulated sector such as energy, regulatory changes are rarely just about numbers. They affect day-to-day operations, safety considerations and the balance between efficiency and compliance.
The option to operate at 44 tonnes is now there. But, as so often in fuel transport, the difference between theory and reality lies in the technical detail, and in this case, very much in the braking system.
