What a truck may weigh and measure in the EU, and what the revision changes

Directive 96/53/EC harmonises how large and how heavy heavy-goods vehicles may be, and a useful distinction runs through it: the maximum dimensions apply to vehicles used in both national and international transport, whereas the harmonised maximum weights apply to international traffic — for purely domestic transport, Member States set their own weight limits, which are often higher. In international traffic the ceiling is normally 40 tonnes for a five- or six-axle road train or articulated vehicle, rising to 44 tonnes for intermodal container transport (the exact figure depends on the axle configuration). The standard dimensions are 12.00 m for a rigid motor vehicle, 16.50 m for an articulated vehicle and 18.75 m for a road train, a width of 2.55 m (2.60 m for conditioned or refrigerated bodies) and a height of 4.00 m. Separate per-axle and axle-group limits also apply and remain binding irrespective of the gross-weight ceiling. Several Member States additionally permit longer and heavier combinations — such as the European Modular System — in national traffic, but their use across borders is currently constrained and unevenly regulated.

Because a battery-electric or hydrogen driveline is heavier than a comparable diesel one, the directive already lets clean vehicles carry extra gross weight so that payload is not eroded by the propulsion technology. Under the rules in force, a zero-emission vehicle may exceed the applicable maximum weight by up to 2 tonnes, and a vehicle running on other alternative fuels by up to 1 tonne, with the extra weight tied to the documented additional mass of the technology as certified at type-approval. In practice this lifts a 40-tonne combination to a maximum of roughly 42 tonnes when zero-emission — a figure the Commission itself describes as "42 tonnes at present." The allowance is real but bounded: the per-axle limits still bind, so the extra tonnes translate into usable payload only where the axle loads and the chosen configuration can absorb them. Whether a given vehicle qualifies, and for how much, therefore depends on its type-approval documentation rather than on a blanket entitlement.

The Commission's proposal reworks these incentives. For zero-emission road trains and articulated vehicles it would replace the current technology-linked allowance with a flat uplift of 4 tonnes — lifting the ceiling to 44 tonnes "irrespective of the weight of the zero-emission technology," so operators keep the benefit as batteries become lighter. It would extend the same 4-tonne intermodal weight allowance more broadly to lorries, trailers and semi-trailers used as intermodal transport units. On dimensions, it would let vehicles exceed the maximum length to fit rear-mounted aerodynamic devices and elongated aerodynamic cabs (with the extra cab length also usable to house zero-emission technology), add up to 90 cm of length specifically to accommodate zero-emission technology, allow 15 cm extra for 45-foot containers and swap bodies in intermodal operations, and raise the height limit to 4.30 m for vehicles carrying high-cube (9'6") containers on the road leg of an intermodal journey. None of these figures are in force yet; they describe the proposal as tabled.

The proposal also tackles the patchwork that today makes cross-border operation of longer and heavier combinations legally uncertain. A new Article 4(4a) would let a Member State authorise European Modular Systems in national and international traffic, provided it publishes the applicable weights, dimensions and eligible road network, connects that network to neighbouring Member States that also allow such systems so cross-border traffic can flow, and runs a monitoring scheme assessing safety, infrastructure and modal effects. Where a Member State already permits such combinations nationally, it could not then refuse international traffic by equivalent combinations that meet its national limits. A transitional Article 4b reinforces this for weight: a Member State that allows combinations above the standard limits in national traffic could not refuse international traffic by equivalent combinations up to 44 tonnes — a rule set to apply until 31 December 2034. The effect would be to enable cross-border use chiefly between adjacent Member States that already accept these vehicles domestically, rather than opening the whole EU network.

The revision is not yet law. The Commission published COM(2023) 445 on 11 July 2023; the European Parliament adopted its first-reading position on 12 March 2024; the Council agreed its general approach on 4 December 2025; and interinstitutional trilogue negotiations began on 9 December 2025. Until the co-legislators conclude and the resulting text is transposed, Directive 96/53/EC as it stands remains the binding reference, and the higher allowances above should be treated as the likely direction of travel rather than a current entitlement. If your fleet planning or a cross-border route depends on the outcome — particularly the move to a flat 4-tonne zero-emission allowance — it is worth tracking the trilogue, because the final figures and dates can still shift before adoption.

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