Loads and Dimensions 2026 in Quebec: The Practical Guide (Carriers and Fleets)
This article summarizes elements from the Guide to Load and Dimension Standards for Road Vehicles, 2026 Edition published by the Ministère des Transports et de la Mobilité durable. The guide specifies that it is an informational document and that applicable obligations come from regulatory texts.
The general objective of these standards is to support road safety and protect infrastructure. In practice, they are used to quickly verify whether a truck, trailer, or combination complies in terms of dimensions, axle loads, and gross vehicle weight, including adjustments related to the thaw period.
PDF Guide – Loads and Dimensions 2026 in Quebec
1) Key Definitions (to correctly read the tables)
Before reading the tables, you need to understand a few terms. These determine the correct category and the correct limit.
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Spacing: longitudinal distance between the centers of the first and last axle in an axle group.
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Wheelbase: longitudinal distance between the center of the front steering axle and the center of the rear drive axle farthest from the vehicle.
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Effective rear overhang: distance between the center of the last axle (or axle group) and the rear of the vehicle, including the load, according to the guide’s measurement method.
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GVWR (gross vehicle weight rating): maximum nominal mass indicated by the manufacturer.
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GAWR (gross axle weight rating): maximum nominal mass on an axle indicated by the manufacturer.
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Double train: combination consisting of a towing vehicle or tractor and more than two towed units, including at least one semi-trailer.
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Track width: transverse distance between the centers of the tire contact surfaces on the same axle.
2) Basic Limits (must know by heart)
Maximum vehicle dimensions (general rule)
For a motorized road freight vehicle, the general limits commonly used as benchmarks are:
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Maximum length: 12.5 m, including the load
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Maximum width: 2.6 m
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Maximum height: 4.15 m
The guide also mentions cases where the maximum vehicle length is reduced depending on the configuration with a towed unit.
What is not counted in certain measurements (common examples)
According to the guide, certain elements such as accessories or equipment may not be included in certain measurements, provided conditions are met and maximum limits are respected. This may include items such as certain mirrors, bumpers, steps, hitching devices under conditions, or specific equipment.
Common exception: rear aerodynamic device
A retractable or foldable rear aerodynamic system may allow a small excess in length when deployed, within a specific limit and under certain conditions.
3) Dimensions by common configurations (useful excerpts)
The guide presents limits by type of combination. Here are practical benchmarks for the most common configurations.
Bus and coach
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Bus or coach: maximum length 14 m
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Articulated bus or coach: maximum length 18 m
Towing vehicle with standard trailer
The guide provides a typical maximum total length of 23 m for the combination and adds other constraints depending on configurations, such as the towing vehicle length, rear overhang, and certain offsets related to the hitch.
Tractor with type 1 semi-trailer
Notably includes:
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Maximum combination length: 23 m
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Maximum semi-trailer length: 16.2 m
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Maximum kingpin offset: 2 m
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Effective rear overhang: capped as a percentage of the semi-trailer wheelbase
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Correspondence tables between tractor wheelbase and semi-trailer wheelbase
Tractor with type 1 semi-trailer with dolly
The guide distinguishes permitted length with and without a dolly, with a higher maximum length when a dolly is present, under certain conditions.
Double trains (types A, B, C)
Double trains have higher length limits than single combinations but come with wheelbase tables, spacing requirements, and minimum distances between axles and axle groups. Some transitional provisions exist for specific periods under defined conditions.
4) Axle loads: how to apply the table logic
Simple rule: always take the lowest limit
The maximum allowable load on an axle or axle group generally corresponds to the lowest value among:
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the limit given by the axle load category table
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the capacity resulting from the installed tires
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limits related to GAWR and specific rules for the front steering axle
In other words, even if the table allows a value, tires or GAWR may lower the actual limit.
Normal period vs thaw period
The axle load table distinguishes between:
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normal period
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thaw period
During the thaw period, several categories see their limits reduced. This is a critical point to avoid violations in the spring.
Special rules not to miss
The guide includes several specific provisions, for example:
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cases of automatic limit reductions for certain axle categories
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specific values for snow removal
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specific rules for certain buses
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targeted increases during thaw for specific configurations, with an important clarification: these increases are not used to establish the total allowable mass in the gross mass table
5) Gross vehicle weight: the logic of the combination table
Basic rule
The gross vehicle weight of a vehicle or combination corresponds to the minimum between:
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the limit from the gross mass table according to the vehicle or combination category
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the sum of maximum allowable axle loads
Even if your total weight seems compliant with the table, the sum of axle loads may be more restrictive, or vice versa.
Examples of covered categories
The guide provides categories for:
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single vehicles (2 axles, 3 axles, specialized configurations)
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towing vehicles with standard trailers
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towing vehicles with semi-trailers
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tractors with semi-trailers
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double trains of different types
The more complex the configuration, the more critical the conditions related to minimum distances and specific wheelbases become.
Special case: dolly
The guide provides a classification rule in the gross mass table for certain combinations with a dolly, under specific conditions. The idea is that the category can be determined without considering the dolly in certain classification calculations.
6) Thaw period: key takeaways
The guide explains that the thaw period generally runs from mid-March to the end of May, and that Quebec is divided into three zones. Exact dates may vary depending on the year and the zone.
In practice, the best approach is simple:
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check when your zone enters the thaw period
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apply thaw-period limit columns for axle loads
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ensure your total weight remains compliant after reduced axle loads
7) Camions BL Checklist (before departure, before purchase, before delivery)
Dimensions checklist
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Measure height, width, total length, and length including load according to the configuration.
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Validate the combination category (single vehicle, trailer, semi, double train).
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Check specific limits for the combination, including wheelbases, kingpin or hitch offsets, and overhang.
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If special equipment is present, confirm whether it can be excluded from a measurement under guide conditions.
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If a rear aerodynamic device is installed, confirm the permitted excess and usage conditions.
Load and weight checklist
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Identify the axle or axle group category.
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Apply the table limit, then verify tires and GAWR, and keep the lowest value.
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Calculate total weight as the minimum between the gross mass table and the sum of axle loads.
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During thaw period, redo the calculation using thaw limits.
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If your activity involves special cases (snow removal, buses, targeted exceptions), apply the specific rules.
8) How Camions BL can help
If you are planning to purchase a truck, a semi-trailer, or a more complex combination, the issue is not only power or comfort. It is also the ability to remain compliant and efficient according to your reality: load, routes, periods, and type of transport.
At Camions BL, we can help you:
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clarify your actual configuration (axles, wheelbases, type of semi or trailer)
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verify dimension and load logic before it becomes a problem on the road
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guide equipment choices based on your usage
The guide remains an informational document: for complex cases or high-risk situations, it is recommended to validate with applicable regulatory requirements.
FAQ
Does the load count in the length?
In many configurations, the maximum length is expressed including the load. The exact method depends on the type of combination and applicable diagrams.
Why is it more complex during the thaw period?
Because several axle load limits decrease, which can make a combination non-compliant even if it is compliant during the normal period.
Where do I find the allowable gross weight?
You use the gross mass table according to the vehicle or combination category, then compare it with the sum of maximum allowable axle loads. The correct limit is the lowest of the two.
Here are direct links to the Ministère des Transports et de la Mobilité durable:
Marketing and Communications Director at BL Trucks, based in Granby, Quebec. Responsible for brand strategy, content and communications, with a focus on growth, visibility and marketing performance.