What happens if I'm caught with an overloaded axle?

The vehicle receives a prohibition order and cannot move until the overload is resolved. In practice: roadside unloading, a second vehicle to collect excess cargo, and a fine. Germany charges €75 base plus €235 per tonne overloaded per axle group. The Netherlands applies a progressive scale reaching €5,000+. In the UK, the penalty is up to £300 per tonne per axle. Total cost including delay, unloading, and secondary transport typically reaches several thousand euros. The driver, haulier, and loading company can all face charges simultaneously.

How do I calculate axle loads without a weighbridge?

Use the lever rule: for a single item of weight W at distance d from the kingpin, on a trailer of total length L, the bogie contribution is W × d/L and the kingpin contribution is W × (L–d)/L. Add trailer tare for each axle group. For multiple items, sum each item's contribution independently. A load planning tool automates this for any number of items and is accurate to within 3–5% of a physical weighbridge when tare data is correct.

Does cargo height affect axle loads?

Cargo height affects lateral stability and rollover threshold — the higher the centre of gravity, the lower the safe cornering speed. However, it has minimal effect on vertical axle loads under normal conditions. What drives axle load imbalance is longitudinal position (front-to-back) and lateral position (left-to-right). Side-to-side imbalance causes one side of an axle to carry more than the other — most EU regulations require each side to be within 10% of the total axle group weight.

My total payload is within the GVW limit — can I still fail an axle check?

Yes, and this is the most common misunderstanding. A 22,000 kg payload on a standard trailer is well within the 40,000 kg GVW — but if that cargo is stacked at the kingpin end, the kingpin load can reach 18,000+ kg against a 12,000 kg limit, while the bogie carries only 7,000 kg. Total weight compliance and axle compliance are checked completely independently. You can have a legal total weight and multiple illegal axle loads at the same time.

How much does shifting cargo 1 metre change the axle load?

On a standard 13.62 m EU trailer, shifting the cargo centre of gravity 1 metre toward the bogie increases bogie load by (cargo mass ÷ 13.62) and decreases kingpin load by the same amount. For a 15,000 kg payload: 1 m shift ≈ 1,100 kg transferred. For a 20,000 kg payload: 1 m shift ≈ 1,470 kg. This means a 2-metre position correction on a 20,000 kg load moves nearly 3,000 kg between axle groups — the difference between a roadside prohibition order and a clean pass.

Truck Loading Guide

How Cargo Position Changes Axle Loads

Moving cargo 1 metre along the trailer shifts over 1,000 kg between axle groups. Learn the physics, the EU limits, and how to balance every load correctly.

5th wheel limit

12,000 kg

Trailer bogie

21,000 kg

Drive bogie

19,000 kg

Steer axle

7,500 kg

Max GVW

40,000 kg

Axle Load Visualizer

Move the slider to see how cargo position changes kingpin and bogie loads

Kingpin overloaded — move cargo toward door

CAB

5th

bogie

20,000 kg payload

DOOR

CoG position: 4.1 m from cab drag to adjust

Kingpin (5th wheel)

16,500 kg / 12,000 kg limit

↑ Kingpin overloaded — move cargo toward door

Trailer bogie

9,500 kg / 21,000 kg limit

Loading Guide

How to distribute axle loads correctly

Follow this sequence before every loaded trip — axle violations in most EU countries result in a prohibition order and fines of €1,000–€10,000 per axle group.

Know your truck's tare axle loads

Before loading a single item, you need the unloaded axle weights. The registration document lists total tare weight — not the per-axle split. Weigh the empty truck on a weighbridge, or use the manufacturer's axle load certificate. A typical 5-axle tractor-trailer carries roughly 5,500–6,500 kg on the drive bogie and 2,000–3,500 kg on the trailer bogie when empty.

Calculate available capacity per axle group

Subtract tare axle loads from the legal limits to find your loading headroom. If your drive bogie tare is 6,000 kg and the limit is 19,000 kg, you have 13,000 kg of capacity there. The kingpin is the most commonly overloaded point — a heavy drive bogie tare can leave only 5,000–6,000 kg of 5th wheel capacity before the 12,000 kg legal ceiling.

Place the heaviest items in the centre-forward zone

The centre of the trailer — roughly 4–8 m from the kingpin — distributes load most evenly between both axle groups. Start with the heaviest cargo here. Never place dense items right at the cab end: a 2,000 kg pallet at the very front of the trailer imposes almost all of its weight on the kingpin, contributing almost nothing to the bogie.

Apply the lever rule to estimate position

The trailer acts like a lever balanced between the kingpin (cab end) and bogie (door end). Cargo near the kingpin loads the kingpin; cargo near the bogie loads the bogie. The ratio is proportional to distance: cargo sitting at 25% of trailer length puts 75% of its weight on the kingpin and 25% on the bogie. Use this rule to sense-check position before running a full calculation.

Validate with a load calculator before departure

Manual estimates are a starting point — always validate with a load planning tool before leaving the yard. Enter each item's weight and position; the tool calculates exact kingpin and bogie loads including tare. If either limit is breached, adjust cargo position and recalculate. This takes 2–3 minutes and prevents a €5,000+ roadside enforcement action.

Recheck axle loads after each delivery stop

Unloading at a stop changes the distribution of remaining cargo. What was balanced for a full load may be out of compliance with half the freight gone. On multi-drop routes, recheck the axle calculation after any significant unload — especially if heavy items were removed from one end of the trailer.

EU Regulations

EU axle load limits for tractor-trailers

Standard limits under EC Directive 96/53. Individual member states may apply stricter national rules — always verify for your operating territory.

Max GVW (5-axle)

40,000 kg

44,000 kg for intermodal

Steer axle

7,500 kg

Single non-driven axle

Drive bogie

19,000 kg

Dual axle, ≥1.8 m spacing

Trailer bogie

21,000 kg

Dual axle, ≥1.3 m spacing

Kingpin (5th wheel) load

12,000 kg

The kingpin load is the vertical force on the 5th wheel plate. It is not measured directly by roadside axle scales — inspectors calculate it from steer and drive axle readings. Exceeding 12,000 kg stresses the tractor frame and triggers an automatic prohibition order in most EU countries.

Overload fines

€1,000 – €10,000

Fines are applied per overloaded axle group. Germany, the Netherlands, and Scandinavia apply the harshest penalties — German fines exceed €10,000 per axle for overloads above 20%. The driver, haulier, and loading company can all be held liable simultaneously. Repeat violations result in licence suspension.

When to recalculate

Before every trip

EU regulations place responsibility for load distribution on both the driver and the loading party. A printed loading plan with calculated axle weights is your primary legal defence in a roadside inspection. Recalculate after any cargo change, including partial unloads on multi-drop routes.

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