Regulatory Framework
Commercial trucking in Ontario is primarily governed by the Highway Traffic Act (HTA) and enforced by the Ministry of Transportation Ontario (MTO). The MTO oversees carrier safety through the CVOR (Commercial Vehicle Operator's Registration) system, roadside enforcement, facility audits, and the National Safety Code standards.
Ontario also enforces federal regulations under the Motor Vehicle Transport Act, which covers hours of service, and the Transportation of Dangerous Goods Act for hazmat shipments. Understanding both provincial and federal layers is essential for compliance.
CVOR System
Ontario's CVOR system is the backbone of carrier safety regulation in the province. Operators of trucks with a registered or actual gross weight over 4,500 kg must hold a valid CVOR, and buses built to carry 10 or more passengers and tow trucks need one at any weight. Trucks and buses plated in another Canadian province or territory are exempt if they run on a valid safety fitness certificate from their home jurisdiction; see what counts as a commercial vehicle in Ontario for the full weight test and other exemptions. The system tracks collisions, inspections, convictions, and audit results, producing a violation rate that determines your safety standing.
Carriers with poor violation rates face graduated sanctions — from warning letters to CVOR suspension. Maintaining a clean CVOR is not just about avoiding fines; it affects your ability to win contracts, secure insurance, and keep your trucks on the road.
Weight Limits
Ontario's weight limits depend on a vehicle's configuration, axle spread and tires. The Highway Traffic Act sets base limits for each axle unit, and vehicles that meet one of the designated configurations in Ontario Regulation 413/05, known as SPIF (safe, productive and infrastructure-friendly) vehicles, follow that regulation's limits instead, which are generally higher than those for non-compliant vehicles. Overweight convictions carry fines and can add points to your CVOR record.
The table below is a summary of axle limits on Class A highways, which include the King's Highways, most city, town and village streets, and most paved county and township roads; other roads, and roads under a reduced load period, have their own, generally lower, limits. Spread is the distance between the first and last axles of the unit. The official limits, including caps based on tire width and the manufacturer's axle ratings, are in sections 115 to 118 of the Highway Traffic Act and in O. Reg. 413/05.
| Axle unit | Highway Traffic Act base limit | Designated tractor with a fixed-axle semi-trailer (O. Reg. 413/05, Schedule 1) |
|---|---|---|
| Steering (front) axle | 5,000 kg, or up to the maker's axle rating if the driver carries written proof of it | 5,000 kg, or up to 7,700 kg with written proof of the maker's axle rating |
| Single axle | 9,000 kg on single tires; 10,000 kg on dual tires | 10,000 kg |
| Tandem (dual) axle | 15,400 kg at a spread of 1.0 to under 1.2 m and 17,000 kg at 1.2 to under 1.3 m, rising to 19,100 kg at 1.8 m or more; no more than 18,000 kg without dual tires | 18,000 kg at a spread of 1.2 to under 1.8 m; 19,100 kg at 1.8 m or more on dual tires |
| Tridem (triple) axle | 19,500 kg at a spread of 2.0 to under 2.4 m, 21,300 kg at 2.4 to under 2.8 m, 21,700 to 22,000 kg at 2.8 to under 3.0 m and 23,000 kg at 3.0 to under 3.2 m, rising to 28,600 kg at 4.8 m or more; no more than 27,000 kg without dual tires | 21,300 kg at a spread of 2.4 to under 3.0 m; 24,000 kg at 3.0 to under 3.6 m; 26,000 kg at 3.6 to 3.7 m |
There is no single gross weight limit. For a designated tractor with a fixed-axle semi-trailer, the allowable gross vehicle weight is the actual weight on the steering axle plus the maximums for the other axles: with 5,000 kg on the steering axle and two 18,000 kg tandems, a five-axle unit may gross 41,000 kg, and with a tridem spread 3.0 to under 3.6 m in place of the trailer tandem, a six-axle unit may gross 47,000 kg. A tractor-semitrailer that does not meet a designated configuration is held to lower gross limits: at most 36,500 kg with five axles and 46,000 kg with six. A designated B-train double with eight or nine axles can reach 63,500 kg, and long combination vehicles (LCVs), which need a special permit, may not carry more than that.
Ontario enforces weight limits through permanent scales, portable scales, and targeted enforcement campaigns. Overweight fines are calculated based on the amount of excess weight — they can reach thousands of dollars for a single violation.
Speed Limiter Law
Ontario is one of the few jurisdictions in North America that mandates speed limiters on heavy trucks. The law requires:
- Commercial motor vehicles built after December 31, 1994 that have an electronic control module and a manufacturer's gross vehicle weight rating of 11,794 kg or more must have a functioning speed limiter
- The limiter must be set to a maximum speed of 105 km/h
- Tampering with, removing, or disabling the speed limiter is a provincial offence
On conviction, a speed limiter offence carries a fine of $250 to $20,000 under section 68.1 of the Highway Traffic Act. A law passed in June 2026 will raise the minimum to $1,000 once the province brings that change into force. The speed limiter rule applies to qualifying trucks operating in Ontario, regardless of their home province. If you are an Alberta carrier running into Ontario, your trucks must comply.
Winter Tire Requirements
Ontario does not require winter tires on commercial vehicles; neither the Highway Traffic Act nor its tire regulation requires them. Ontario's winter driving advice still says winter tires improve traction and can shorten braking distances by as much as 25%, and that tires designed for severe snow carry the three-peak mountain snowflake symbol. Studded tires are another matter: on vehicles rated over 3,500 kg, Ontario allows them only on emergency vehicles, school buses and road service vehicles, so most trucks cannot use them.
Other provinces set their own rules. British Columbia, for example, requires drivers to obey winter tire and chain signs from October 1 to April 30, and requires vehicles licensed at 11,794 kg or more, such as tractor-trailers, to carry steel chains on most major highways in winter.
Hours of Service (HOS)
Canada's hours of service regulations differ from US rules in several important ways. Ontario Regulation 555/06 sets the hours of service for commercial vehicles on Ontario highways, and carriers that cross provincial or national borders must also follow the federal Commercial Vehicle Drivers Hours of Service Regulations. Both use the same core limits, and the US FMCSA rules do not apply when driving in Ontario:
| Rule | Canada (federal and Ontario) | US (FMCSA) |
|---|---|---|
| Daily driving limit | 13 hours | 11 hours |
| On-duty and shift limits | No driving after 14 hours on duty in a day, or once 16 hours have passed since the last 8 consecutive hours off | No driving after the 14th hour after coming on duty |
| Daily off-duty requirement | 10 hours (8 consecutive) | 10 consecutive hours |
| Weekly cycle options | Cycle 1: 70 hours/7 days Cycle 2: 120 hours/14 days | 60 hours/7 days or 70 hours/8 days |
| Cycle reset (optional) | 36 consecutive hours off (Cycle 1) 72 consecutive hours off (Cycle 2) | 34 consecutive hours off |
| Sleeper berth split | Solo driver: two periods of at least 2 hours each, totalling at least 10 hours | Two periods totalling at least 10 hours: one of at least 7 hours in the berth, the other at least 2 hours |
Note that Canadian drivers have a higher daily driving limit (13 hours vs. 11 hours in the US) but the off-duty requirements and cycle structures differ. Carriers operating cross-border must ensure drivers comply with the applicable rules in each jurisdiction. For deferral, adverse driving conditions, logbook records and fines, see our guide to Canada's hours of service rules.
Electronic logging devices (ELDs) have been mandatory since June 12, 2021 for drivers of federally regulated carriers who must keep a daily log, with penalties enforced from January 1, 2023 after a period of progressive enforcement. Ontario has required certified ELDs since June 12, 2022 for truck drivers who operate only in Ontario and must keep a daily log, with penalties since January 1, 2023; bus drivers in the same situation have needed them since July 1, 2023. Your ELD must be on Transport Canada's certified device list. TruckerPro integrates with supported ELD providers to sync your drivers' duty status and remaining hours automatically.
Mandatory Entry-Level Training (MELT)
Since July 2017, Ontario has required new applicants for a Class A (tractor-trailer) licence to complete an approved MELT program before taking the road test. A Class D licence (trucks over 11,000 kg) has no mandatory training requirement. The Class A MELT curriculum includes:
- 103.5 hours minimum of combined in-class, in-yard, and in-cab training
- 36.5 hours of in-class instruction (regulations, trip planning, cargo securement)
- 17 hours of in-yard training with the vehicle stopped, such as the pre-trip inspection
- 50 hours of behind-the-wheel (in-cab) training, off-road and on the road, including manoeuvres such as reversing, coupling and parking
MELT programs are offered by approved training providers, such as registered career colleges. Costs typically range from $7,000 to $12,000 depending on the school. Employers who fund MELT training for new hires may be eligible for help through the Ontario Job Grant; see our guide to trucking grants in Canada.
Annual Vehicle Inspections (PMCVI)
A truck and any trailer or converter dolly it draws need a PMCVI (Periodic Mandatory Commercial Vehicle Inspection) every year when their combined weight is over 4,500 kg, and tow trucks need one at any weight. Buses and other passenger vehicles with 10 or more passenger seats are inspected every six months. These inspections are done only by a technician at a certified DriveON Vehicle Inspection Centre. DriveON replaced the old Motor Vehicle Inspection Station (MVIS) program, which ended on March 31, 2025; MVIS stations could not issue annual or semi-annual stickers from August 1, 2024. The inspection is based on National Safety Code Standard 11, Part B, and covers:
- Power train
- Steering and suspension
- Brake systems, hydraulic and air
- Instruments and auxiliary equipment
- Lamps and electrical system
- Body, tires and wheels
- Coupling devices (fifth wheel, pintle hook)
A vehicle that passes gets a sticker: an annual sticker is valid until the end of the twelfth month after the month of inspection, and a semi-annual sticker until the end of the sixth month. Operating, or letting someone operate, a vehicle that needs one without a valid sticker or other proof of inspection is an offence under section 85 of the Highway Traffic Act, with a fine of $200 to $20,000, and an officer can seize the sticker and the number plates. MTO counts an expired annual sticker among its most common roadside findings that do not put a vehicle out of service.
Trip Inspections
In addition to annual inspections, Ontario requires a daily inspection, commonly called a pre-trip or circle check, for most commercial vehicles, including trucks whose gross or registered gross weight is over 4,500 kg and tow trucks of any weight. For trucks, tractors and trailers, the inspection follows Schedule 1 of Ontario Regulation 199/07 and must be completed, with an inspection report, before driving. It is valid for 24 hours, and any defect found later in the trip must be added to the report and reported to the operator. Operators keep the reports for at least 6 months.
Common pre-trip inspection items include air brake pressure, tire condition, lights and signals, mirrors, coupling devices, windshield wipers, and cargo securement. A major defect means the vehicle must not be driven until it is repaired. Failure to conduct or document trip inspections is a common audit finding and roadside violation. Our guide to Ontario truck inspections covers the PMCVI, Schedule 1 defects, report contents and fines in detail.
Staying Compliant
Ontario's regulatory environment rewards carriers who build compliance into their daily operations. The carriers that avoid CVOR sanctions, pass audits, and win contracts are the ones that treat compliance as a business function — not an afterthought.
TruckerPro's compliance tools flag annual inspections coming due, track driver licence and certification expiries, record your CVOR violation rate and status, and show hours of service from supported ELDs, so these records sit in one system.