USDOT Marking Size & Placement — FMCSA Rules
Regulation 49 CFR 390.21(b)(1) · Canada
§The Law
49 CFR 390.21(b)(1) — Regulation 49 CFR 390.21(b)(1)
“USDOT numbers must be displayed in letters at least 2 inches high, in a contrasting colour, on both sides of the power unit in a location where they can be read.”
View official regulation text✓Plain English
FMCSA requires 2-inch minimum USDOT letters on both cab sides. The cab door is the standard location — visible to DOT officers at roadside stops.
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Specific Requirements
2" minimum height
Cab door or forward cab panel
Both driver and passenger sides
Legible from 50 feet per FMCSA guidance
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Shop USDOT DecalsOr call (289) 228-7021Regulation Quick Facts
- Regulation
- 49 CFR 390.21(b)(1)
- Jurisdiction
- 🇨🇦 Canada
- Category
- Cross-Border Compliance
What if 49 CFR 390.21(b)(1) changes next year?
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