Hazmat Vehicle Marking — FMCSA DOT Requirements
Regulation 49 CFR Part 172 Subpart F · Canada
§The Law
49 CFR Part 172 Subpart F — Regulation 49 CFR Part 172 Subpart F
“Vehicles transporting hazardous materials must display DOT placards identifying the hazard class, UN number, and comply with FMCSA hazmat marking requirements.”
View official regulation text✓Plain English
Hazmats get diamond-shaped placards showing what dangerous goods are inside. Class 3 (flammable), Class 8 (corrosive), etc. These are mandatory for cross-border moves.
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Specific Requirements
DOT placards — diamond shaped
Hazard class number in placard
UN number for specific material
USDOT number plus hazmat markings
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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.
🏛 Official Government Sources
FMCSA — Federal Motor Carrier Safety Administration
US Department of Transportation · March 2026
FMCSA regulates commercial vehicles entering the US. Canadian carriers need USDOT numbers, MC authority, and compliant vehicle markings for cross-border operations.
USDOT Number Requirements — 49 CFR Part 390
US Electronic Code of Federal Regulations · March 2026
49 CFR Part 390 defines USDOT number display requirements: minimum 2-inch letters, contrasting colour, on both sides of the power unit.
CBSA — Canada Border Services Agency Commercial
CBSA · March 2026
CBSA commercial regulations for cross-border trucking. Covers pre-arrival manifests, customs bonds, and documentation requirements.
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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Shop USDOT DecalsOr call (289) 228-7021Regulation Quick Facts
- Regulation
- 49 CFR Part 172 Subpart F
- Jurisdiction
- 🇨🇦 Canada
- Category
- Cross-Border Compliance
What if 49 CFR Part 172 Subpart F changes next year?
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