Class A CDL restrictions are letter codes printed on your commercial license that block you from operating certain equipment or from driving in certain conditions. They come from federal rules at 49 CFR 383.95 and 383.153, and each one traces back either to how you performed on the skills test or to your medical qualifications. Driving outside a restriction is a federal serious traffic violation, so it pays to know exactly what each code on your license means and how to get it off.
Equipment Codes on a Class A License
Four federal codes limit the equipment a Class A holder can legally operate. Each is triggered by something specific about the vehicle you tested in.
E: No Manual Transmission
Take the skills test in a truck with an automatic transmission and you receive an E code. With E on your license, you cannot operate any commercial vehicle equipped with a manual transmission. For this rule, “automatic” means anything that isn’t a traditional clutch-and-shifter setup you work yourself.
L: No Air Brakes
The L restriction lands on your license if you failed the air brake knowledge test or tested in a vehicle without air brakes. It bars you from operating any commercial vehicle with any type of air braking system. Because almost every Class A combination runs on air brakes, an L code effectively locks you out of standard tractor-trailer work.
Z: No Full Air Brakes
Z is a narrower cousin of L. You get a Z when you pass the skills test in a vehicle with air-over-hydraulic brakes rather than a full-air system. You can still drive air-over-hydraulic setups, but not any vehicle whose brakes run entirely on compressed air. In practice, that still keeps you out of most standard tractor-trailers.
O: No Tractor-Trailer
The O restriction is unique to Class A. It applies when you take the skills test in a combination vehicle where the power unit and trailer connect by pintle hook or another non-fifth-wheel coupling. A fifth-wheel tractor-trailer handles very differently, so the O code prevents you from driving the classic semi setup. This one catches drivers off guard: you can hold a Class A CDL, pass every part of the test, and still be barred from the vehicle most people picture when they hear “Class A.”
Medical and Geographic Codes
K: Intrastate Only
A K code confines you to commercial driving inside the state that issued your license. It usually appears for one of two reasons. Either you meet your state’s intrastate medical standards but not the stricter federal physical qualifications for interstate driving, or you’re between 18 and 20 and not yet eligible for interstate commercial driving under federal rules. Lifting a K restriction that stems from a medical issue means meeting the full federal physical qualifications and obtaining a valid Medical Examiner’s Certificate that confirms interstate fitness.
V: Medical Variance
A V code means FMCSA has granted you a medical variance, such as a vision exemption or a skill performance evaluation. Once FMCSA notifies your state that a variance exists, the state places V on your license and your CDLIS record. V itself doesn’t restrict equipment; it flags that your medical qualification depends on a federal approval that has to stay current.
Corrective Lenses and Other State Codes
Federal physical standards require at least 20/40 distant visual acuity in each eye and a horizontal field of vision of at least 70 degrees in each eye. If you only meet those thresholds with corrective lenses, your state will note it on your license, most often with the code “A.” That letter is a state assignment, not one of the federally standardized codes. Driving without your prescribed eyewear when the code is on your license is a violation. States can also add their own restriction codes beyond the federal list, provided each one is explained on the license document itself.
What Happens If You Drive Outside a Restriction
Operating a commercial vehicle outside the scope of your restrictions is a serious traffic violation under federal law. Penalties escalate with repeat offenses within a three-year window:
- A second serious violation in three years: 60-day disqualification from operating any commercial vehicle.
- A third or subsequent serious violation in three years: 120-day disqualification.
These disqualification periods come from 49 CFR 383.51 and apply nationwide, because every state feeds violations into the CDLIS system. Federal rules group restriction violations with other serious offenses like speeding 15 or more miles over the limit and improper lane changes, so a restriction violation paired with any other serious offense in three years triggers the same schedule.
How to Remove a Restriction
The path off depends on the code. Equipment restrictions come off by retesting in a vehicle that no longer triggers the limitation. Medical restrictions come off with updated documentation showing you meet the higher standard.
E, L, and Z
To lift an automatic transmission, air brake, or full-air-brake restriction, you pass a modified skills test. Federal rules let states administer a shortened version focused on the area where you were limited rather than requiring you to repeat the full three-part exam. For L or Z, you also have to pass the air brake knowledge test and perform the air brake pre-trip inspection.
O
The tractor-trailer restriction is the hardest to remove. You must retake all three components of the skills test in a tractor-trailer connected by a fifth wheel: vehicle inspection, basic control maneuvers, and on-road driving. There’s no shortened version, because the handling of a fifth-wheel combination differs fundamentally from what you originally demonstrated.
Permits, Training, and Paperwork
Before you test, you’ll need a Commercial Learner’s Permit that covers the vehicle type you plan to use, so you can practice in the new configuration under supervision. Entry-Level Driver Training does not apply here: FMCSA explicitly exempts drivers removing restrictions under 49 CFR 383.135(b)(7) from the ELDT mandate, so no registered training program is required first.
Schedule the test through a state-certified examiner or an approved third-party facility. After passing, bring the signed results and any required fees to your licensing office. The agency updates your CDLIS record so law enforcement and employers see your current status. You’ll usually get a temporary paper document at the counter and the new physical card in the mail within a couple of weeks.
Fees
Costs vary widely by state and by which restriction you’re removing. Some states charge under $15 for a simple license amendment; others charge $100 or more when a skills test is involved. Your total may also include the Commercial Learner’s Permit fee, a separate charge for the skills test if a third party administers it, and the updated license card. Confirm the numbers with your state’s driver licensing agency before you begin, and budget for truck rental if you don’t have access to the right vehicle for the test.