The weight of virtue: the EU rewards cleaner trucks… and heavier ones

The decarbonisation of freight transport has an irony that few acknowledge: to emit less, trucks will have to carry more kilos. The new European Union regulation on weights and dimensions admits this without blushing: it allows up to six additional tonnes for zero-emission vehicles. The reason is as obvious as it is uncomfortable: batteries are heavy. A long-haul electric truck can carry between three and five tonnes of accumulators alone, not including cooling systems and structural reinforcements. Thus, the ecological hero arrives at the scales with a burden that dangerously approaches the 44-tonne limit. The paradox is clear: the climate solution is bulking up the problem of road infrastructure.

Brussels has set the bar at 44 tonnes for cross-border operations, but with small print that dampens any euphoria. This figure is not the result of materials science; it is the outcome of an arithmetic mean between the 40 tonnes of Mediterranean countries and the 48 or more demanded by Nordic nations and the logistics sector. The problem is that this average, neat on the blackboard, becomes murky on the road. Because the regulation adds a condition: from 2035, only zero-emission vehicles will be allowed to circulate at 44 tonnes. Until then, traditional combustion vehicles will coexist with the same maximum weight, but without the bonus. It is a transition that rewards clean technology but punishes predictability.

Among the headlines about global tonnages, a technical detail of enormous consequence has slipped in quietly: the allocation of an additional 12.5 tonnes on the drive axle. To the layperson, it sounds like a hieroglyph. To the haulier, it is a lifeline. Electric trucks are not only heavier but also concentrate that weight unevenly. Batteries are usually placed on the chassis, but the driving force still falls on the rear axle. By allowing almost thirteen tonnes on that point, the EU prevents tyres from deteriorating within weeks and bridges from suffering asymmetric fatigue. This is a regulation that speaks the language of physics: not more weight per se, but better distributed.

The second great silent success is the authorisation of longer cabs. At first glance, it seems a concession to driver comfort in a sector suffering from a chronic shortage of drivers. But it is also an unavoidable technical necessity. Zero-emission trucks require power electronics, inverters, thermal management systems and, in the case of hydrogen, tanks and fuel cells. None of that fits under the driver’s bunk. Lengthening the cab is not a luxury; it is the only way for clean technology to fit without amputating the living space of someone who spends 300 days a year behind the wheel. For the first time, ergonomics and ecology are travelling in the same lane.

Now comes what the regulation did not want to see. While extra kilos are being incentivised for battery trucks, the European Modular System (EMS) is deliberately ignored – those mega-trucks of up to 25 metres and 60 tonnes already operating in Sweden or the Netherlands. Their efficiency has been proven: they reduce emissions per tonne transported by between 20% and 30% without any additional batteries. Why are they not supported? Because the EMS clashes with two European fears: the fear of bridges collapsing and the political panic that “bigger trucks” sounds like environmental backtracking. The IRU has denounced it bluntly: “It is short-sighted to impose barriers on the EMS.” The current regulation rewards clean technology but punishes logistical efficiency. And deep down, this regulation is the portrait of a Europe of forced consensus: an average that gives a little to everyone and satisfies no one. Environmentalists see it as lukewarm, hauliers as uncertain, engineers as incoherent.

There is an uncomfortable silence that the regulation does not resolve: who pays for the extra weight? Ninety percent of European freight transport is carried out by SMEs with fewer than ten vehicles. For them, a zero-emission truck costs twice as much, weighs more and only recovers the investment if it takes advantage of the permitted 44 tonnes – but for that it needs fast-charging infrastructure that does not yet exist on many routes. So the small hauler is left in a dead end. Meanwhile, Brussels cannot reinforce by decree the 1.2 million European bridges built in the 1960s. The Commission itself admits that around 15% of the bridges on the TEN-T network are not certified to withstand repeated 44-tonne loads. The regulation allows more weight for clean vehicles, but does not require member states to certify their bridges. The result will be a geography of uncertainty: German or Dutch roads prepared, Italian or Greek bridges de facto forbidden.

The last great debate that this regulation sidesteps is false technological neutrality. In theory, electric, hydrogen and biofuels can all qualify for the weight incentives. But in practice, the additional six tonnes are only truly usable by battery vehicles. Hydrogen weighs less per kWh stored, but its tanks and fuel cells add considerable ballast; biofuels require no extra weight, but receive no bonus either. The regulation incentivises weight, not energy efficiency or carbon lifecycle. A hydrogen truck could be cleaner over its entire lifecycle than an electric one with giant batteries, but because it weighs less, it receives less help. The EU has confused “zero emissions from the tailpipe” with “real zero emissions”. And in doing so, it has tacitly chosen an industrial winner.