Requirements
Intrastate vs interstate CDL: what’s the difference?
New drivers usually meet this question at the DMV counter, when the form asks them to pick interstate or intrastate. Below is what each choice means, how the K restriction and DOT physical work, when an in-state load still counts as interstate and what your choice means for getting hired and insured.
Intrastate vs interstate CDL at a glance
The license class (A, B or C) and endorsements are the same either way. What changes is which rulebook you drive under. Federal driver rules in 49 CFR part 391 apply to interstate driving, while your state sets intrastate rules within limits FMCSA allows under 49 CFR 350.305.
| Rule | Interstate (non-excepted) | Intrastate |
|---|---|---|
| Where you can drive | Across state lines and on in-state legs of interstate freight | Only commerce that starts and ends in your state |
| Minimum age | 21 under 49 CFR 391.11 | Set by your state, but no lower than 18 |
| Medical card | Federal medical examiner’s certificate required | State rules; non-excepted intrastate drivers also need one |
| Hours of service | Federal limits in part 395 | State limits; may allow 12 hours driving within 16 on duty |
| Code on the license | None for this purpose | Often K, “intrastate only” |
The four self-certification categories
Under 49 CFR 383.71, every CDL applicant certifies one of four types of driving, and you certify again at renewal, upgrade and transfer. Massachusetts’ Registry of Motor Vehicles lists the codes most states use:
- NI, non-excepted interstate: you cross state lines and must meet the federal medical card rules. Most over-the-road and regional truck drivers pick this.
- EI, excepted interstate: you drive interstate but only in work excepted from the federal driver qualification and medical rules.
- NA, non-excepted intrastate: you drive only within your state and must meet your state’s driver qualification rules, including a medical certificate.
- EA, excepted intrastate: you drive only within your state in work excepted from the state’s medical rules.
When an in-state trip still counts as interstate
FMCSA says transportation done exclusively in your business’s home state is intrastate commerce. But the federal definition in 49 CFR 390.5 also counts a haul between two points in the same state as interstate when it passes through another state or is one leg of a shipment that started or will end outside the state.
That third pattern catches many intrastate drivers. As an illustration, a K-restricted driver pulling an import container from a port to a warehouse 40 miles away, all inside one state, is likely handling interstate freight, because the container’s trip began overseas. Whether a specific load qualifies depends on the facts of the shipment, so ask FMCSA or your state’s motor carrier office if your work sits near the line.
DOT physical: intrastate vs interstate
Non-excepted interstate drivers need a medical examiner’s certificate, and Massachusetts notes that both non-excepted interstate and non-excepted intrastate drivers must be examined by a medical examiner on FMCSA’s National Registry. If your medical certification lapses, your state downgrades the license and you lose the commercial privilege.
The real difference is what happens when a driver does not meet the federal physical standards in 49 CFR 391.41. Under 49 CFR 350.305, states may keep qualifying long-time intrastate drivers whose condition has not worsened, and may run variance programs for intrastate drivers with conditions that would otherwise disqualify them. A driver who qualifies only through a state variance is limited to intrastate work, which is one common reason a K restriction appears on a license.
Drivers under 21 and the K restriction
Age is the other main reason drivers end up intrastate. Federal rules require interstate drivers to be at least 21, while 49 CFR 350.305 lets states license intrastate drivers from age 18. Federal rules give states the code K, “intrastate only,” to print on those licenses.
The one federal route around the age rule has closed to new drivers. Trucking Dive reported in January 2026 that FMCSA’s Safe Driver Apprenticeship Pilot for 18- to 20-year-olds ended on November 7, 2025, and that enrolled drivers who finished training keep their exemption until they turn 21. For everyone else, interstate driving starts at 21.
What your CDL type means for trucking insurance
A legal license is the minimum; insurers set their own bar. FreightWaves reports the generally accepted insurance guideline is a Class A CDL, age 25 and two years of driving experience. Drivers who are younger or newer can still be insured in many cases, but often at a higher premium or with fewer insurers willing to quote.
The restriction matters too. Underwriters pull each driver’s motor vehicle record, which shows the K code, so a carrier that runs across state lines should expect questions about any intrastate-only driver on the schedule. Dispatching that driver on interstate freight violates the license restriction and invites trouble at roadside inspection and in a claim.
Your operation follows the same split. Carriers hauling in interstate commerce need a USDOT number, and for-hire carriers of regulated freight also need FMCSA operating authority and a federal insurance filing. Intrastate-only carriers follow their state’s registration and insurance rules, and FMCSA lists 38 states plus Puerto Rico that require a USDOT number from intrastate carriers too. Check your state agency before you buy a policy, because the limits and filings differ. A broker such as Florin can compare quotes from insurers whose driver rules fit your team.
How to change your CDL from intrastate to interstate
Once you meet the federal driver rules, the switch is mostly paperwork with your state licensing agency.
- Confirm you are at least 21, the federal minimum for interstate driving.
- Pass a DOT physical with an examiner listed on FMCSA’s National Registry and keep the certificate current.
- File a new self-certification as non-excepted interstate (NI). Massachusetts, for example, accepts a category change form by mail.
- Ask your DMV whether it will reissue the license without the K restriction and what that costs, since fees and steps vary by state.
- Tell your employer or insurer once the new license is issued so your driver file and motor vehicle record match your work.
Frequently asked questions
What does a K restriction on a CDL mean?
K is the federal restriction code for “intrastate only” under 49 CFR 383.153. It usually appears because the driver is under 21 or qualifies medically only under a state program, and it bars interstate commercial driving.
Can an 18-year-old with a CDL drive across state lines?
Generally no. Interstate drivers must be at least 21 under 49 CFR 391.11. The federal apprenticeship pilot that let some 18- to 20-year-olds drive interstate ended in November 2025, and only enrolled drivers who finished training kept an exemption.
Do intrastate CDL drivers need a DOT medical card?
Usually yes. Drivers who certify non-excepted intrastate must meet state qualification rules, which include a medical examiner’s certificate, though states may grant variances to intrastate drivers that federal rules would not allow.
Can an intrastate driver haul freight that came from another state?
Not if that load is part of an interstate shipment. Under 49 CFR 390.5, an in-state leg of freight that started or will end outside the state is interstate commerce, even if the truck never crosses a state line.
Figures are third-party estimates and examples, not quotes. Coverage depends on the policy terms and underwriting, and rules vary by state.