Technical weighbridge portal
Weighbridge dimensions and capacity: how to choose
When sizing a weighbridge, length and capacity are usually the first figures requested, but they cannot be selected in isolation. A weighbridge for trucks, articulated lorries or articulated vehicles must be designed around the actual fleet, the way vehicles approach the platform, the weight to be measured and the operating process in which weighing will take place.
I Bilanciai makes all its weighbridges to measure. The starting point is therefore not to choose a fixed catalogue size, but to establish which vehicles need to be weighed today, which may use the installation in future and what characteristics the system needs in order to work correctly in the available yard.
Reference dimensions for the range extend from 4.50 × 3 metres up to 18 × 3 metres, with capacities up to 60,000 kg. These values help indicate the scale of the available solutions, while the final project is developed around the company's actual requirements.
An 18-metre weighbridge is not automatically better than a 14- or 16-metre one, just as a capacity greater than necessary does not automatically improve the installation. Correct sizing means finding the right balance between vehicles, available space, weighing capacity and intended use.
In this guide
- Length depends first of all on the vehicles
- Why weighbridges come in very different lengths
- Width and the approach route
- How long should a weighbridge be for articulated lorries and articulated vehicles?
- Capacity: what it means
- A 60-tonne weighbridge is not always the best choice
- Dimensions and capacity must be designed together
- Weighing frequency matters too
- Bridge dimensions are not the same as the space required in the yard
- When the yard already exists
- Reference table
- Do not confuse weighbridge capacity with truck weight
- Capacity alone does not tell you how accurate a weighbridge is
- Correct sizing means avoiding two opposite mistakes
Length depends first of all on the vehicles
For static weighing of the entire vehicle, the truck must fit correctly on the usable weighing deck.
A rigid lorry, an articulated lorry and an articulated vehicle do not have the same overall dimensions and do not necessarily require the same platform. If different vehicle types use the same facility, the project must take into account the most demanding vehicle that will need to be weighed and realistic future developments in the fleet.
The useful question is therefore not 'how long is a truck weighbridge?', but rather what is the longest vehicle that will need to be weighed completely on the platform.
Because I Bilanciai weighbridges are made to measure, length can be defined according to the vehicle fleet and the process, avoiding both undersizing and unused metres.
Why weighbridges come in very different lengths
The range of dimensions reflects the range of applications. A shorter platform may be sufficient where shorter vehicles are weighed; at the other end of the range, 18-metre configurations can accommodate much longer vehicles.
The availability of solutions up to 18 metres does not mean that every company needs one. Oversizing takes up space, can increase the civil works required and affects cost without automatically providing an operational benefit.
Likewise, saving on length when part of the fleet needs more space can turn the weighbridge into a permanent limitation.
Width and the approach route
A width of 3 metres is common in the I Bilanciai reference configurations and is an important figure for heavy-vehicle weighing.
The figure must, however, be considered together with the traffic layout. A correctly sized weighbridge can still be inconvenient if it is installed on an approach that forces trucks into difficult manoeuvres or an unnatural alignment.
Where the yard already exists, bridge width, entrance geometry, fences, buildings and loading areas should be assessed on the same plan.
How long should a weighbridge be for articulated lorries and articulated vehicles?
When the installation regularly weighs articulated lorries and articulated vehicles, the length must be defined according to the actual vehicle combinations.
The criterion remains static weighing of the complete vehicle. It is necessary to know whether the fleet is relatively uniform or whether customers' and suppliers' vehicles arrive in widely varying configurations. In the latter case, greater flexibility may be appropriate, because the weighbridge must continue to work even as the vehicles arriving at the gate change.
Capacity: what it means
Capacity indicates the maximum load specified for the instrument configuration. I Bilanciai weighbridges are available with capacities up to 60,000 kg.
This value should not be interpreted as a normal operating target. A weighbridge with a 60-tonne capacity does not necessarily have to work routinely close to that limit.
Sizing should consider the weight of vehicles when empty and loaded, the materials handled, the most demanding realistically foreseeable conditions, the intended use of the data and the metrological characteristics of the instrument.
A 60-tonne weighbridge is not always the best choice
The availability of high capacities can suggest that choosing the maximum is always safer for the future. That is not the correct criterion.
Capacity, metrological characteristics, length and structure must be considered together. If the fleet operates well below certain values, increasing capacity indiscriminately does not necessarily provide a benefit.
Where the site receives heavy vehicles, variable loads or external hauliers, an appropriate margin should be included in the design. The important word is appropriate, not maximum.
Dimensions and capacity must be designed together
A very long weighbridge with insufficient capacity is wrong; a high-capacity weighbridge that is too short for the vehicles using it is equally wrong.
The project therefore relates vehicle type, length, expected weight, frequency of use and yard conditions. Made-to-measure production avoids the idea of a configurator in which length and capacity are two independent values: they are parts of the same installation.
Weighing frequency matters too
Two companies may weigh the same trucks and still have different operating requirements.
A weighbridge used only a few times a day works under different conditions from one crossed continuously at peak times. The number of vehicle movements affects not only use of the structure, but also waiting areas, traffic direction, first and second weighing, and whether software or self-service may be useful.
A correctly sized platform can still become a bottleneck if trucks cannot approach and leave it in an orderly way.
Bridge dimensions are not the same as the space required in the yard
An 18-metre weighbridge does not occupy only 18 metres of a facility.
The vehicle must reach the structure, align with it, drive fully onto the weighing deck and then clear it. Above-ground installations also require the development of approaches; floor-level installations still need adequate space for entry, exit and manoeuvring.
When assessing the weighbridge on a site plan, therefore, do not draw only the rectangle of the structure: draw the truck route as well.
When the yard already exists
A site plan makes it possible to assess entrance positions, direction of travel, space before and after the weighbridge, obstacles, buildings, fences, loading areas and manoeuvring possibilities.
This information should be supplemented with vehicle lengths, expected weights and traffic frequency. Together, these factors define a genuinely made-to-measure weighbridge.
A quotation based on the actual site is far more useful than a generic request such as '18-metre, 60-tonne truck weighbridge', because it makes it possible to check whether those figures are really necessary.
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Reference table
| Factor | What it determines |
|---|---|
| Longest vehicle | Required usable length |
| Vehicle geometry | Ease of access and alignment |
| Maximum expected weight | Weighbridge capacity |
| Number of vehicle movements | Traffic-flow organisation |
| Own vehicles or third-party vehicles | Flexibility margin |
| Floor-level / over-floor | Civil works and overall space requirement |
| First and second weighing | Traffic organisation |
| Software and self-service | How the operation is managed |
| Future fleet development | Design allowance |
| Available space | Overall configuration |
Do not confuse weighbridge capacity with truck weight
The word truck covers many different types of vehicle. For weighbridge sizing, it is more useful to know the actual vehicles than to rely on a generic figure found online.
The weight that the scale is technically capable of measuring should also not be confused with road-traffic limits, authorised masses or other requirements applicable to vehicles. These are separate issues.
Capacity alone does not tell you how accurate a weighbridge is
Greater capacity does not automatically mean a more accurate weighbridge.
Capacity describes an instrument limit, while metrological characteristics must be considered together with other parameters, including scale interval and the intended configuration.
When the data is used in operations subject to legal metrology, these aspects must be defined for the specific instrument and its intended use.
Correct sizing means avoiding two opposite mistakes
The first mistake is to build a weighbridge that is too small and later discover that it cannot handle some of the vehicles arriving at the facility. The second is to oversize everything, buying length and capacity that will not be used and imposing unnecessary space requirements on the yard.
By knowing the vehicles, weights, traffic frequency, yard configuration and method of use, a made-to-measure weighbridge can be sized for what it needs to do today and for realistic future developments in the business.
QUICK ANSWERS
Frequently asked questions
How long should a truck weighbridge be?
It must be long enough to accommodate the vehicle correctly for static weighing. I Bilanciai weighbridges are made to measure, taking into account rigid lorries, articulated lorries, articulated vehicles and the characteristics of the yard.
What are the dimensions of a weighbridge for articulated lorries?
They depend on the articulated lorries that will use the installation. I Bilanciai reference configurations range from 4.50 × 3 m up to 18 × 3 m, but the weighbridge is designed to measure.
Are 18-metre weighbridges available?
Yes. I Bilanciai produces configurations up to 18 × 3 metres. Eighteen metres is an available option, not a mandatory size for every truck weighbridge.
How wide is a truck weighbridge?
Three metres is a recurring reference width in I Bilanciai configurations. Width must still be assessed together with the approaches and site geometry.
What is the maximum capacity of an I Bilanciai weighbridge?
The range reaches up to 60,000 kg. The actual capacity is defined by the project according to the vehicles and intended use.
Is a 60-tonne truck weighbridge always the best choice?
No. Capacity must be appropriate for the weights actually expected. Increasing it without a specific need does not automatically improve the installation.
Are I Bilanciai weighbridges standard or made to measure?
They are made to measure. Dimensions, capacity and configuration are defined according to the vehicles, yard and operating requirements.
Do you necessarily need an 18-metre weighbridge to weigh an articulated vehicle?
That cannot be determined without knowing the vehicle. The length must be defined according to the actual configuration of the articulated vehicles that will use the installation.
How much space is needed for a lorry weighbridge?
More space is needed than the bridge surface alone. Entry, exit and manoeuvring must be considered, and above-ground installation also requires space for the approaches to the platform.
Can I have an 18-metre weighbridge with a different capacity?
Dimensions and capacity are part of the project configuration. The correct combination is defined according to the vehicle and intended application.
Further reading
Technical sources
- Weighbridges — I Bilanciai
- Varnished Weighbridge — I Bilanciai
Last technical review: 1 September 2026. Published by I BILANCIAI S.r.l.
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