Every delivery run starts with a simple question: how much can this vehicle legally carry? Get it wrong and you risk fines, invalid insurance, damaged tyres and unsafe handling. The rules are not box-ticking. They keep lorries, vans and trailers stable, protect roads and bridges, and safeguard everyone on the network. Whether you run a single 3.5-tonne van or a fleet of artics, knowing gross vehicle weights, axle limits and payload is essential.

The basics: gross vehicle weight and plated limits

Gross vehicle weight (GVW)—or maximum authorised mass (MAM)—is the maximum total weight a vehicle can legally be when fully loaded. It includes the vehicle, fuel, driver, passengers, tools and cargo. It is a hard ceiling set by the manufacturer and confirmed on the plating certificate, usually inside the cab. A 7.5-tonne lorry has a GVW of 7,500kg; an 18-tonne rigid is 18,000kg. Articulated combinations have a gross train weight (GTW) covering tractor, trailer and load. You can downplate to reduce a vehicle’s legal weight, but you cannot uprate beyond the manufacturer’s design.

Axle weights: the hidden limit

Even if your total weight is under the GVW, you can still be overloaded on one axle. Every axle has its own plated limit, and the DVSA checks these separately. A typical 18-tonne rigid might have a front axle limit of 7,500kg and a rear limit of 11,500kg. Load a heavy pallet at the very back and you can exceed the rear axle limit while staying under the total. That is illegal and makes the vehicle unstable. Artics are sensitive to fifth wheel position and trailer bogie settings. A weighbridge with axle pads is the only reliable check.

Payload, train weight and towing rules

Payload is what remains after the vehicle’s kerbside weight—the vehicle with a full tank, tools and driver, but no cargo. If a van has a GVW of 3,500kg and a kerbside weight of 2,200kg, its payload is 1,300kg. That must cover passengers, equipment and goods. Many 3.5-tonne vans have payloads under 1,000kg once a driver and fuel are added. For towing, the gross train weight (GTW) is the maximum combined weight of towing vehicle and trailer, including loads. The trailer has its own plated weight, and the towing vehicle has a maximum towing capacity. Never exceed any of them.

How overloading happens in practice

Overloading is rarely deliberate. A pallet of tiles is heavier than expected. Two extra boxes go on at the last minute. The driver forgets the fuel tank is full and the crew of three adds 240kg. A van that was legal at the depot becomes illegal after a collection. Seasonal peaks make it worse: parcels, building materials and agricultural loads are classic culprits. Poor load distribution also causes problems. Even if total weight is fine, putting all the weight over one axle or on one side can breach axle limits and make handling dangerous.

Practical checks before you leave the yard

• Know your plated weights. Check the plating certificate for GVW, axle limits and train weight. Keep a copy in the cab.
• Use a weighbridge. Weigh empty, then loaded. Get individual axle weights if possible. Public weighbridges cost a few pounds and take minutes.
• Calculate payload honestly. Include driver, passengers, fuel, tools and equipment. Do not forget the spare wheel and tail lift.
• Distribute the load evenly. Put heavy items over or between axles, not at the rear. Secure everything so it cannot shift.
• Check tyres and suspension. Look at pressures and sidewalls. If the vehicle looks low at the back, it probably is.
• Plan for collections. If you pick up more goods mid-route, recheck the weight. A nearby weighbridge is worth the detour.

What happens if you get it wrong

Overloading is a serious offence. The DVSA can issue fixed penalties, prohibit the vehicle from moving until the load is reduced, and prosecute. Fines can run into thousands of pounds, and both driver and operator may be liable. Your insurance may be invalid if the vehicle was overloaded at the time of an incident. That means you could be personally responsible for damage, injury and legal costs. An overloaded vehicle is also harder to steer, slower to stop, and more likely to suffer tyre or brake failure. Taking a few minutes to check weights is basic professional practice. Know your gross vehicle weight, axle limits and payload—and stay legal, safe and on the road.