Compliance Lettering Minimum Size Reference — Canada
Regulation O.Reg 424/97 + SOR/2010-91 + CARs · Canada
§The Law
O.Reg 424/97 + SOR/2010-91 + CARs — Regulation O.Reg 424/97 + SOR/2010-91 + CARs
“Different authorities specify different marking rules: Ontario CVOR certificate carried in cab, PCL 75mm, USDOT per FMCSA, aircraft 30cm, drones legible on aircraft.”
View official regulation text✓Plain English
Quick reference: Ontario CVOR certificate carried in cab (O.Reg 424/97; no exterior height mandate), PCL boat number 75mm (3"), USDOT legible from 50 feet (49 CFR 390.21), aircraft C-XXXX 30cm (12"), drone registration 25mm (1").
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Specific Requirements
CVOR — certificate in cab (O.Reg 424/97); exterior display is professional practice, no minimum height codified
USDOT — legible from 50 feet in daylight (49 CFR 390.21)
PCL number — 75mm (3") minimum
Aircraft registration — 30cm (12") minimum
Drone label — 25mm (1") minimum
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📚Sources & Authority
Every claim on this page is backed by official government legislation and verified industry sources. Last verified: March 2026.
All sources are official government publications or recognized industry authorities. Links verified March 2026. If you find a broken link, let us know.
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- Regulation
- O.Reg 424/97 + SOR/2010-91 + CARs
- Jurisdiction
- 🇨🇦 Canada
- Category
- Compliance Materials Standards
Source library
Confirm the current rule before relying on a marking
Our guides are a starting point for locating government sources connected to O.Reg 424/97 + SOR/2010-91 + CARs markings. Requirements can depend on jurisdiction, vehicle or site details, and the date you act.
- Open the linked official source and check its current version.
- Confirm the rule applies to your exact vehicle, vessel, property, or operation.
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