Dump Truck Weight Marking Requirements Ontario

Dump Truck Weight Marking Requirements Ontario

The importance of weight markings on dump trucks cannot be overstated. With heavy loads and frequent stops by Ministry of Transportation (MTO) officers, ensuring your vehicle complies with the Highway Traffic Act is crucial for avoiding fines and maintaining operational efficiency.

Ontario Highway Traffic Act s.7 Requirements for Weight Markings

The Ontario Highway Traffic Act, specifically section 7, mandates that all commercial vehicles display weight markings prominently on their vehicle to avoid penalties and ensure road safety.

TARE Weight Marking: What It Means

The TARE weight is the empty weight of your dump truck. This marking must be displayed clearly and permanently on both sides of the cab door or frame, adhering strictly to MTO guidelines to avoid discrepancies during inspections.

GVW (Gross Vehicle Weight) Marking: Maximum Loaded Weight

The GVW marking indicates the maximum weight your dump truck can carry when fully loaded. This must be displayed on both sides of the cab door or frame, ensuring visibility and compliance with regulations.

Physical Location on Vehicle

Both TARE and GVW markings should appear on the cab doors or door frames on both sides to ensure they are visible from either direction. These markings must be permanently affixed to prevent any tampering or accidental removal.

Size Requirements for Legibility

To meet MTO standards, all numerals and company name lettering must be legible from a distance of at least 15 metres. Company names should have letters no less than 3 inches high to ensure clear visibility during inspections or weigh-ins.

Reflective Requirements: Visibility in Low Light

In the aggregate and construction industries, where early morning and dusk operations are common, reflective markings play a critical role in ensuring your dump truck can be seen by MTO officers. Using reflective vinyl ensures compliance with low light visibility requirements.

Company Name and CVOR Requirements on the Same Vehicle

The company name must appear alongside the CVOR (Commercial Vehicle Operator Registration) number on both sides of the cab doors, adhering to HTA s.7(1). This double compliance ensures your vehicle is fully registered with all necessary information visible at a glance.

What Happens at MTO Scales

During weigh-in-motion or full inspections, dump trucks are often pulled over for detailed checks. If the TARE weight is not displayed correctly, as happened in Vineland on QEW where an inspector found a truck lacking proper markings and issued a $350 fine, you risk immediate penalties.

Fines: Incorrect Weight Markings

Incorrect or missing weight markings can result in fines under the HTA. Overweight penalties are separate and severe, calculated per tonne over the legal limit, making it imperative to maintain accurate and visible markings at all times.

Common Mistakes with Dump Truck Weight Markings

• Inaccurate TARE weight: Not updating the empty vehicle weight after modifications can lead to incorrect GVW calculations.
• Poor placement: Markings should be on both sides of the cab doors for easy visibility by inspectors during stops and weigh-ins.
• Non-compliant materials: Using standard vinyl instead of reflective material can result in non-visibility during low light conditions, leading to fines or operational disruptions.

How to Update Weight Markings When Vehicle is Modified or Re-plated

Whenever your dump truck undergoes modifications that affect its empty weight (e.g., adding new equipment or changing the body), it's critical to update both TARE and GVW markings. This ensures compliance with MTO regulations, avoiding fines and operational disruptions.

Last Verified: March 2026 | Sources: Ontario Highway Traffic Act, MTO Commercial Vehicle Standards and Safety Branch, Ontario Regulation 557, O. Reg 493/17