What Is a USDOT Number?
A USDOT (United States Department of Transportation) number is a unique identifier assigned to commercial motor carriers operating in the United States. It is issued by the Federal Motor Carrier Safety Administration (FMCSA) and is used to track a carrier's safety record, inspections, compliance reviews, crash data, and insurance.
Canadian carriers that cross the US border — even once — must have a USDOT number. The number must be displayed on every power unit that enters the United States.
MC Number Requirements
An MC (Motor Carrier) number is required in addition to the USDOT number if you are a for-hire carrier transporting regulated commodities in interstate commerce. Canadian carriers hauling freight for hire into the US typically need both.
- MC number required if: You transport property or passengers for hire across state lines or the international border
- MC number NOT required if: You are a private carrier (hauling your own goods only) or exempt commodities
- Format: MC-XXXXXX (MC followed by 6 digits)
- Display: Must be displayed on both sides of the power unit alongside the USDOT number
Cross-Border Trucking Kit — USDOT + MC + CVOR
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Who Needs DOT Compliance?
You need a USDOT number if you operate any of the following in the United States:
- Vehicles with a GVWR of 10,001 lbs (4,536 kg) or more
- Vehicles designed to transport 9+ passengers (including the driver) for compensation
- Vehicles designed to transport 16+ passengers (including the driver) regardless of compensation
- Any vehicle transporting hazardous materials requiring placards
Vehicle Marking Requirements — 49 CFR 390.21
FMCSA regulation 49 CFR 390.21 specifies exactly what must appear on every commercial motor vehicle:
Common DOT Violation Codes
These are the most common FMCSA violation codes related to vehicle marking and identification that Canadian carriers encounter at roadside inspections and border crossings:
Fleet Compliance & Audits
FMCSA conducts compliance reviews and safety audits of carriers. Canadian carriers are subject to the same audit process as US carriers. Key areas inspected:
- Vehicle marking: Every power unit checked for USDOT, MC, carrier name, contrasting colour
- Driver qualification files: CDL, medical certificates, driving records
- Hours of service: ELD compliance, daily logs, exemptions
- Vehicle maintenance: Inspection records, DVIR (Driver Vehicle Inspection Reports)
- Insurance: BOC-3 process agent designation, minimum insurance ($750,000 for general freight, $5,000,000 for hazmat)
- Drug & alcohol testing: Pre-employment, random, post-accident, reasonable suspicion
How to Apply for USDOT & MC Numbers
Register with FMCSA Unified Registration System
Go to safer.fmcsa.dot.gov and create an account. Canadian carriers register as foreign motor carriers.
Complete the Application
Provide company information, vehicle details, commodities hauled, and operational scope. No fee for USDOT; MC authority filing requires a $300 USD fee.
File BOC-3 (Process Agent Designation)
Required for MC authority. Designate a process agent in each US state you operate in. Process agent services typically cost $30–$100 USD.
Obtain Insurance
File proof of financial responsibility with FMCSA. Minimum $750,000 for general freight. Your insurance company files the Form BMC-91 or BMC-91X.
Mark Your Vehicles
Display USDOT number, MC number (if applicable), and carrier name on both sides of every power unit per 49 CFR 390.21. Order decals before your first US trip.
Canadian vs. US Marking Requirements
Canadian carriers crossing the border need BOTH Canadian and US markings. Here is how they compare:
| Requirement | Canada (Ontario) | United States |
|---|---|---|
| Carrier ID | CVOR number (Ontario) | USDOT + MC number |
| Minimum Height | 50 mm (2") | 50 mm (2") |
| Location | Both sides of power unit | Both sides of power unit |
| Magnetic Signs | Not acceptable | Only if leased vehicle |
| GVW Display | Required (kg) | Not required on exterior |
| Owner Name | Required | Required (legal or DBA) |
USDOT & MC Number Decals
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Penalties & Out-of-Service Orders
Cross-Border Compliance Checklist
- USDOT number is current and active (check FMCSA SAFER system)
- MC authority is active (if for-hire carrier)
- USDOT number displayed on both sides of power unit — min 2" height
- MC number displayed on both sides (if applicable)
- Legal carrier name or DBA displayed on both sides
- Contrasting colour to vehicle background
- Legible from 50 feet (15 metres)
- CVOR number also displayed (for Ontario base plate)
- GVW displayed in kilograms (Canadian requirement)
- BOC-3 process agent filing current
- Insurance filings current with FMCSA (BMC-91/91X)
- USDOT biennial update completed
- ELD compliant and operational
- Driver qualification file complete
Related Cross-Border & Trucking Guides
Get Cross-Border Compliant
Our Cross-Border Trucking Kit includes USDOT, MC, CVOR, company name, and GVW decals — everything for both sides of your power unit. Ships in 1-2 business days.