Guides · LoadLegit · 2026-08-05

Ontario, Quebec, Alberta & BC: provincial rules beyond the MOU

The interprovincial MOU guarantees your truck is accepted across provincial borders — but each province also runs its own weight-and-dimension regime on its own roads, and those can be more permissive or more restrictive than the MOU baseline. Here's what to watch in the four provinces we cover in depth.

Ontario — SPIF vehicles

Ontario's Safe, Productive and Infrastructure-Friendly (SPIF) program defines standardised vehicle configurations with axle and weight allowances tuned to protect pavement and bridges. SPIF-compliant trucks can be highly productive on Ontario highways, but the configurations are specific — the allowances depend on your exact axle layout, not just the MOU tandem/tridem numbers. If you run Ontario regularly, know which SPIF class your equipment falls into.

Quebec — spring thaw restrictions

Quebec (like several provinces) imposes seasonal spring-thaw load restrictions — the période de dégel — when the ground softens and roads are vulnerable. During the posted thaw period, allowable axle weights on affected roads are reduced below the normal limits, and the dates shift year to year by region. A load that's legal in January can be over-limit on the same road in April. Check Quebec's current thaw declarations before hauling heavy in late winter and spring.

British Columbia — engine power

British Columbia ties heavy-vehicle operation to engine power: a rig has to have enough power for its gross weight to safely handle BC's mountain grades. If you're running near the top of the weight range through BC's terrain, confirm your power-to-weight meets the provincial requirement — it's a dimension of "legal" that flatter provinces don't enforce.

Alberta

Alberta broadly follows the MOU framework for interprovincial configurations and adds its own permit regime for heavier and oversize loads, including its resource and industrial corridors. As always, the province's own network can allow more than the MOU floor under permit.

The rule of thumb

Treat the MOU as the minimum you're guaranteed across borders, and the province as the authority on what's actually allowed on the road under your wheels today — including seasonal restrictions that don't show up in any static table. Our province weight guides summarise each jurisdiction, and the free calculator checks the MOU baseline in kilograms.

Compliance guidance, not legal advice — provincial rules change seasonally and by road; always confirm with the province's official source before you haul.