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Overweight authorizations in Ontario

Weight privileges under annual permits, including gross and axle-group limits, qualifying axle configurations, and seasonal suspensions.

7 facts, each with the passage it comes from, quoted from 3 official sources.

Where to apply

Where an application for Overweight authorizations is submitted in Ontario.

  • Online · Ministry of Transportation

    PRIO online permitting system

    prio.mto.gov.on.ca (opens in a new tab)

    Before you apply online for the first time, you must register to use the online services by completing a user account form and emailing it to the Ministry of Transportation’s Oversize/Overweight Permit Office at oo.permits@ontario.ca. Once your online services account has been set up, you can use it to apply for as many permits as you need.

  • Phone · Ministère des Transports

    Bureau de délivrance de permis, par téléphone

    416 246-7166

    Contact the permit issuing office during business hours if the route indicated on your permit needs to be changed.

  • Phone · Ministère des Transports

    Bureau de délivrance de permis, par téléphone (sans frais)

    1 800 387-7736

    Contact the permit issuing office during business hours if the route indicated on your permit needs to be changed.

  • Mail · Ministry of Transportation

    Highway Operations Permits Office

    Ministry of Transportation Highway Operations Permits Office 301 St. Paul Street, 2nd Floor St Catharines, Ontario L2R 7R4

    Download and complete an application form. Include payment (Canadian funds only) by visa or Mastercard using an authorization form, cheque made out to the Ministry of Finance, bank draft, money order or certified cheque made out to the Ministry of Finance.

  • Mail · Ontario Ministry of Transportation (MTO) Permit Issuing Office

    Permit Issuing Office, by mail

    301 St. Paul Street, 3rd Floor, St Catharines, Ontario, L2R 7R4

    Application forms must be completed in full. Incomplete applications will be returned.

  • In person · Ontario Ministry of Transportation (MTO) Permit Issuing Office

    Permit Issuing Office

    301 St. Paul Street, 3rd Floor, St Catharines, Ontario, L2R 7R4

  • Email · Ministry of Transportation

    Oversize/Overweight Permit Office, by email

    oo.permits@ontario.ca

    Use it when: For Permitting and Registration for International Registration Plan and Oversize/Overweight (PRIO) online permitting system account set up, tow truck certificate applications, special vehicle configuration permits or project permits

  • Fax · Ministry of Transportation

    Highway Operations Permits Office, by fax

    905-704-2545

    Use it when: Until January 1, 2026

    Download and complete an application form. Include payment (Canadian funds only) by visa or Mastercard using an authorization form, cheque made out to the Ministry of Finance, bank draft, money order or certified cheque made out to the Ministry of Finance.

Start with a question

Open a question to read the facts on file that bear on it.

  • What axle and axle-group weight limits apply, including those for annual tow-truck permits?Nothing on file for Ontario answers this yet.

  • What minimum or maximum axle counts qualify for annual overweight authorization?Nothing on file for Ontario answers this yet.

  • What outer bridge length and steer-to-drive axle spacing are required?Nothing on file for Ontario answers this yet.

Facts

4 topics

Max gross vehicle weight for standard annual permit (kg) (Measures)

Maximum gross weight of a vehicle or vehicle combination authorized by an annual permit, in kilograms.

  • 63,500 kg139,993 lbAnnual permit; vehicles and/or loads (subject to vehicle configuration)
  • 78,000 kg171,960 lbEnhanced annual permit; vehicles and/or loads (subject to vehicle configuration)
  • 63,500 kg139,993 lbParagraph 1 of subsection 1 (1); annual term; fee 448.75 dollars

Max gross weight with overweight privilege under annual permit (kg) (Measures)

Maximum gross vehicle weight up to which an annual permit grants overweight privileges, in kilograms.

63,500 kg139,993 lb

Annual Permits; Combination vehicles

Annual permit weight privileges suspended during reduced load period (Yes or no)

Whether annual permits for moving loads in excess of legal weight limits are invalid on King's highways during the region's reduced load period (true if the region states this restriction).

Yes

Annual permits for moving heavy vehicles, loads, objects or structures in excess of legal weight limits; unless specifically authorized to do so under permit conditions

Months of the reduced load period for annual permits (Choices)

The calendar months during which annual permits for excess-weight moves are not valid on King's highways.

  • Northern Ontario

    • March
    • April
    • May

  • Southern Ontario

    • March
    • April

Where these facts come from