Does a South Dakota truck need a USDOT number for in-state work?
Not for in-state work alone, as far as South Dakota’s published rules show. Any interstate work — including an in-state leg of a load that started or ends in another state — needs one under the federal rule at 10,001 lb.
Checked against South Dakota’s official sources in September 2026.
The rule in South Dakota
Who it covers: Intrastate for-hire and private motor carriers and drivers operating vehicles of 26,001 lb or more, placarded hazmat, or vehicles designed for more than 15 passengers, for the adopted federal safety rules.
The weight line: In-state vehicles below 26,001 lb (rated or actual) are not subject to the federal safety rules (Parts 390-397) unless they carry placarded hazmat or are designed for more than 15 passengers; at 26,001 lb and over they are.
Exemptions the state lists:
- Intrastate vehicles under 26,001 lb (not placarded hazmat, not designed for more than 15 passengers) are not subject to 49 CFR Parts 390-397
“Motor carriers engaged in interstate commerce must have a United States Department of Transportation (USDOT) identification number.” source
“drivers and motor carriers operating intrastate vehicles and combinations of vehicles with a gross vehicle weight rating, gross combination weight rating, gross vehicle weight, or gross combination weight that does not equal or exceed twenty six thousand one pounds ... are not subject to parts 390 to 397” source
The rule: SDCL 49-28A-3 (adoption of federal regulations, intrastate modifications)
Who to ask: South Dakota Highway Patrol, Motor Carrier Services
Safety rules for in-state trucks
South Dakota adopts 49 CFR Part 387 and Parts 390-397 (as amended through Jan 1, 2026) and applies interstate references to intrastate operations, except for intrastate vehicles under 26,001 lb that are not hazmat or large-passenger vehicles. (SDCL 49-28A-3)
- Drivers may be 18 unless interstate, hauling placarded hazmat, or driving a vehicle designed for more than 15 passengers.
The federal lines, which apply in South Dakota too
- 10,001 lb and interstate commerce: a USDOT number, a medical card, a driver qualification file, the hours-of-service rules and daily inspections (49 CFR 390.5).
- 26,001 lb: a CDL, for a single vehicle or a combination towing more than 10,000 lb (383.5). The CDL rules cover in-state driving as well (383.3), and drug and alcohol testing follows the CDL (382.103).
Check your own truck and trailer
Questions
Does South Dakota require a USDOT number for intrastate trucks?
Not for in-state work alone, as far as South Dakota’s published rules show. Any interstate work — including an in-state leg of a load that started or ends in another state — needs one under the federal rule at 10,001 lb.
What is the CDL weight in South Dakota?
The same as everywhere: 26,001 lb for a single vehicle, or a combination of 26,001 lb towing more than 10,000 lb. The federal CDL rules apply to in-state driving too (49 CFR 383.3), and drug and alcohol testing follows the CDL (382.103).
Who administers the rule in South Dakota?
South Dakota Highway Patrol, Motor Carrier Services.
What we could not confirm
- No South Dakota source says in so many words that in-state carriers don't need a USDOT number. The answer rests on FMCSA leaving South Dakota off its list, and on the state handbook describing the number as an interstate requirement.
- South Dakota adopts the federal rules that contain USDOT registration for in-state trucks of 26,001 lb and over; whether it applies the registration part to them was not confirmed.
Sources
- FMCSA, Do I Need a USDOT Number? (South Dakota not listed; read in browser)
- SDCL 49-28A-3 (sdlegislature.gov)
- SDCL 49-28A-1 (definition of motor vehicle)
- South Dakota 2022 Commercial & Agricultural Vehicle Handbook (sdtruckinfo.sd.gov)
General information, not legal advice. It summarises South Dakota’s published rules as read in September 2026; confirm with the South Dakota Highway Patrol or FMCSA.