Alberta Road Bans and Legal Weights, Explained

A road ban is a temporary weight reduction on a specific road, most commonly during spring thaw, to stop heavy vehicles from tearing up the soft surface. Alberta Transportation and Economic Corridors sets bans on provincial highways; counties and municipal districts set their own. Always check live sources for a specific road.

Why road bans happen, and who sets them

When frost comes out of the ground in spring, the ground underneath a road can turn soft and saturated before it fully drains and firms back up. A fully loaded truck on a soft roadbed does far more damage than the same truck on a frozen or dry one, so provinces and municipalities temporarily cut the legal weight a truck can carry on affected roads until conditions improve.

In Alberta, who sets the ban depends on who owns the road: Alberta Transportation and Economic Corridors sets bans on provincial highways (its Central Permit Office handles the permits and exemptions), while counties and municipal districts set their own bans on the roads under their jurisdiction, independent of the province’s schedule. That’s why a highway can be at one restriction level while a county road running alongside it is under a completely different one — they’re two separate authorities acting on their own timelines and their own road conditions.

What a 75% or 90% road ban actually means

The percentage in a road ban refers to how much of a truck’s normal maximum allowable axle weight it can legally carry while the ban is active. As one Alberta municipality puts it plainly: a 75% ban means a vehicle can carry only 75% of its standard allowable axle weight, and a 90% ban allows more — 90% of that same standard maximum.

The pattern most rural roads and highways follow is a seasonal cycle, not a flat rule: many roads run at 90% of allowable axle weight through summer, fall, and winter, then drop to a lower level such as 75% specifically during the spring thaw window, before returning to 90% once the ground firms up. Exact percentages, dates, and which roads are affected vary by jurisdiction and by year’s weather, so treat any specific number here as illustrative, not a current schedule.

Where to check current road bans

Because bans change week to week and even day to day during spring thaw, this page will not publish a “current” list — it would be wrong within days. Instead, check a live source before you plan a route:

• 511 Alberta for real-time provincial highway conditions and restrictions.
• Alberta’s road ban phone line, 1-855-ROADBAN (1-855-762-3226), a toll-free line specifically for provincial highway road ban information.
• The county or municipal district’s own office for any road that isn’t a numbered provincial highway — provincial sources don’t cover municipal roads.

How legal weights are set in Canada, in general

Setting maximum truck weights is fundamentally a provincial and territorial responsibility in Canada, not a federal one. Since February 1988, the Council of Ministers Responsible for Transportation and Highway Safety has maintained a Memorandum of Understanding on vehicle weights and dimensions, which sets common baseline weight and dimension standards so a compliant truck can travel a designated highway network across provincial borders without needing a different configuration in every province. Crucially, the MOU sets a floor, not a ceiling: each province and territory keeps the authority to allow more liberal weights, different axle configurations, or additional permit types within its own borders, which is why exact legal weights and axle-group tables differ from one province to the next even for the same truck configuration.

Alberta’s own weights and dimensions are set out in its Commercial Vehicle Dimension and Weight Regulation, administered under Alberta Transportation and Economic Corridors, which covers standard configurations like tractor-semitrailers, A-trains, and B-trains. This page does not reproduce those axle-by-axle tables — the detailed Super B and multi-axle weight breakdowns are covered in depth elsewhere in this network, and permit-specific configurations should always be confirmed against Alberta’s own regulation or a current commercial permit before you load out.

See our licensing hub if you’re still working toward your Class 1, or our Class 1 licence guide for the province-by-province training breakdown.

FAQ

What are the current road restrictions and bans in Alberta? This page won’t publish a specific current list — road bans change weekly, especially during spring thaw, and a static answer would be out of date almost immediately. Check 511 Alberta or call 1-855-ROADBAN for provincial highways, and contact the specific county or municipal district directly for non-highway roads.

What is a 90% road ban? It means vehicles on the affected road can legally carry up to 90% of the standard maximum allowable weight for each axle group, rather than the full 100%. Many Alberta roads run at 90% through summer, fall, and winter, then drop to a lower percentage such as 75% specifically during spring thaw.

What are legal weights in your jurisdiction? Common combinations? Legal weights are set provincially, not federally, though a 1988 interprovincial Memorandum of Understanding sets shared baseline standards so common configurations like tractor-semitrailers, A-trains, and B-trains can travel across provincial borders. Each province can permit higher weights or different configurations beyond that baseline, so the exact numbers for your combination depend on which province you’re driving in — confirm against that province’s own commercial vehicle weight and dimension regulation.

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