Gross vehicle weight (GVW) is the maximum your vehicle is allowed to weigh when it is fully loaded, including the vehicle itself, fuel, the driver and the load. Go over it, or over a single axle limit, and you are committing an offence the moment the wheels turn. I have watched a DVSA examiner walk a fully laden curtainsider onto a weighbridge and turn a profitable load into a prohibition, a fixed penalty and an awkward phone call to the Traffic Commissioner’s office. Weight is one of those areas where the rules are not negotiable, so it pays to understand the numbers on your plate.
What gross vehicle weight (GVW) actually means
Gross vehicle weight is the same thing as Maximum Authorised Mass (MAM), sometimes called permissible maximum weight or gross plated weight. It is the heaviest the vehicle is legally permitted to be in use on the road, and it already accounts for the vehicle, its fuel, the driver and everything in the back. It is not a target to hit, it is a ceiling you must stay under.
Where people come unstuck is confusing GVW with the other weight terms beside it. Kerb weight, payload, gross train weight and axle weights all describe different things, and getting them muddled is how operators end up overloaded without realising.
| Term | What it means |
|---|---|
| Gross vehicle weight (GVW / MAM) | The maximum the vehicle can legally weigh fully loaded, including vehicle, fuel, driver and load. |
| Kerb weight | What the vehicle weighs empty, with fuel and standard equipment but no driver, passengers or load. |
| Payload | The weight of cargo you can carry. Roughly GVW minus kerb weight, less the driver and any extras. |
| Gross train weight (GTW) / gross combination weight | The total permitted weight of the tractor unit plus the trailer plus the load combined. |
| Axle weight | The maximum permitted weight pressing down through each individual axle. |
| Unladen weight | The weight of the vehicle carrying no goods, excluding fuel and batteries. |
The practical takeaway is simple. Kerb weight is what the vehicle weighs before you do anything. Payload is how much room you have left. GVW is the line you must never cross, and GTW is the same idea for an articulated combination.
Where to find your vehicle’s plated weights
Every goods vehicle carries its weight limits with it. The figures are shown on a plate or sticker fixed to the vehicle, usually inside the driver’s door area, and listed in the owner’s manual. On HGVs you will find a Ministry plate setting out the design weights and the legal plated weights for the gross vehicle, the gross train weight and each axle. The plated axle weights matter as much as the gross figure, because you can be fine on total weight and still be illegal on a single axle if the load sits in the wrong place.
If you run a mixed fleet, record the GVW and individual axle limits for every vehicle somewhere your loaders can see them. A driver who knows the numbers is far less likely to sign for a load that puts the unit over.
How overloading actually happens
Overloading is rarely deliberate. In my experience it comes from two places. The first is total weight, where the load is heavier than someone assumed, the paperwork was optimistic, or pallets got added at a second collection without anyone redoing the sums. The second, and the one people miss, is axle distribution. You can load right up to your gross limit and still be over on the front or rear axle because the weight is bunched at one end. Drop-and-swap trailers, tail-lift kit, partial deliveries and dense product like steel or liquids all make axle overloads more likely.
The fix is boring but effective: know your weights, distribute the load sensibly across the axles, and check on a weighbridge or onboard weighing system when you are anywhere near the limit.
The penalties for overloading
DVSA enforces weight offences through graduated fixed penalties, and the penalty scales with how far over you are. Examiners allow a 5% leeway before issuing a fixed penalty or prohibition, unless the relevant weight has been exceeded by one tonne or more, in which case the leeway does not apply. The bands below are the current DVSA graduated fixed penalty levels for excess weight.
| How far over the limit | Action |
|---|---|
| Less than 10% | £100 fixed penalty |
| 10% up to but not including 15% | £200 fixed penalty |
| 15% and over | £300 fixed penalty |
| 30% and over, or excess of 5 tonnes | Court summons instead of a fixed penalty |
Those amounts can be charged per offence, so an overload that breaches both the gross weight and an axle limit can attract more than one penalty. The fixed penalty is only the start of it. The bigger consequences are these.
- Immediate prohibition. The vehicle is stopped at the roadside and cannot move until the excess weight is removed. That usually means arranging another vehicle, a delayed delivery and a frustrated customer.
- Prosecution for serious cases. Overloads of 30% and over, or an excess of 5 tonnes, normally go to court rather than attract a fixed penalty, as does any load where instability or loss of control is a real risk. Both the driver and the operator can be prosecuted, and the fines available to the courts are substantial.
- OCRS and repute impact. Weight offences feed into your Operator Compliance Risk Score, which raises your colour band and makes you a bigger target for future roadside stops. Repeated or serious overloading can prompt the Traffic Commissioner to call you to a public inquiry, where your repute and your operator’s licence are on the line.
That last point is the one operators underestimate. A £300 ticket is annoying. A damaged OCRS score and a question mark over your good repute are what actually cost you money. For the technical side of safe loading, restraint and weight distribution, see our deeper guide on load securing and vehicle weights.
The HGV road user levy
Separate from weight enforcement, there is a charge for operating heavy lorries on UK roads: the HGV road user levy. It applies to heavy goods vehicles of 12,000kg (12 tonnes) or more. The levy was suspended during the pandemic and reintroduced on 1 August 2023 in a reformed, more environmentally focused form.
Here is how it works in practice:
- UK-registered HGVs pay the levy through the DVLA at the same time and in the same transaction as their vehicle excise duty (VED). You do not make a separate payment, the levy is calculated automatically and bundled in.
- Non-UK-registered HGVs pay through the online HGV levy service before driving on UK roads, and they are charged on a time basis such as daily, weekly, monthly or annually depending on how long they are here.
- How the rate is set. Since the 2023 reform the levy is based on vehicle weight as a broad approximation to CO2, combined with the vehicle’s air quality emissions standard. Cleaner Euro VI lorries pay less and older vehicles pay more, so it rewards a modern, low-emission fleet.
Amounts vary by weight band and emissions class, so check the current gov.uk figure for your specific vehicle rather than a headline number. For most UK operators the key point is that it is collected automatically with your VED, so there is nothing extra to do beyond keeping the vehicle taxed.
Frequently asked questions
What is the difference between gross vehicle weight and kerb weight?
Kerb weight is what the vehicle weighs empty, with fuel and standard equipment but no driver or load. Gross vehicle weight is the maximum it is allowed to weigh once it is fully loaded. The gap between the two, less the driver, is roughly your available payload.
Can you be fined for overloading even if the total weight is legal?
Yes. You can be within your gross vehicle weight and still commit an offence by exceeding an individual axle limit because the load is distributed badly. DVSA can issue a separate penalty for each weight exceeded, so axle overloads matter as much as the gross figure.
How much is the fine for overloading an HGV?
DVSA graduated fixed penalties run from £100 for less than 10% over, to £200 for 10% up to 15%, to £300 for 15% and over. Serious cases, broadly 30% and over or an excess of 5 tonnes, go to court instead, where the fines available are far higher.
Who has to pay the HGV road user levy?
It applies to HGVs of 12,000kg or more. UK-registered lorries pay it automatically alongside their VED, while non-UK-registered lorries pay through the online levy service before using UK roads. It was reintroduced on 1 August 2023 and is now based on weight and emissions.
Who is responsible for an overloaded vehicle, the driver or the operator?
Both. The driver is stopped at the roadside, but the operator is expected to have safe systems for loading, weight checks and supervision. A pattern of overloading reflects on the operator’s repute and can be raised at a public inquiry.
How ETM helps with weights and overloading compliance
Getting your weight systems right is exactly the kind of unglamorous, high-stakes work an experienced transport manager handles every day. External Transport Manager connects operators and fleets with verified transport managers and compliance specialists who can review your loading procedures, set up sensible weight checks and protect your OCRS score. If overloading, axle distribution or licence repute is a worry, request transport manager support and we will match you with someone who has handled it before.
Need practical transport compliance support?
Send one enquiry through the independent ETM platform so suitable, vetted Transport Managers can understand the work before they quote.