How to Get a Commercial Driver License: Requirements, Testing, and State Differences

Once you pass, the examiner issues a Medical Certificate valid for two years (or one year if you are over 65). You must carry this certificate or a copy when you drive commercially. If your certificate expires, your CDL becomes invalid until you renew it. Some states allow you to renew the medical certificate without retesting if your condition has not changed, but you still must see an examiner.

The Written Knowledge Test

Your state's Department of Motor Vehicles publishes a CDL Manual (sometimes called the Commercial Driver Guide) that covers all the material on the written test. You can read it free from your state DMV website or pick up a printed copy at a DMV office. The manual covers federal regulations, vehicle safety, cargo handling, hazardous materials, and emergency procedures.

The written test itself is usually taken at a DMV office on a computer or paper form. The number of questions and passing score vary by state — most require 80% correct, and tests typically have 50 to 100 questions depending on which endorsements you are testing for. You can usually take the test multiple times if you fail, though some states charge a fee for retakes.

Many people study the manual on their own; others attend a commercial driving school that covers the material in a classroom setting. A school does not replace the test, but it can help you understand the concepts. Some employers offer tuition reimbursement or pay for training if you commit to working for them after you get your CDL.

The Skills Test and Behind-the-Wheel Examination

After you pass the written test, you schedule a skills test with an examiner certified by your state. This test has three parts: a pre-trip inspection, a backing maneuver, and an on-road driving test. You must bring the actual vehicle you will be driving commercially — you cannot use a different truck or bus for the test.

In the pre-trip inspection, the examiner watches you walk around the vehicle and point out safety features: lights, brakes, tires, mirrors, coupling devices (if it is a tractor-trailer), and emergency equipment. You explain what you are checking and why. This is not a written test; it is a demonstration that you know the vehicle and can spot problems before they cause an accident.

The backing maneuver tests your ability to reverse the vehicle into a tight space — typically an alley dock or a 90-degree angle. You must do this without hitting cones or curbs. The on-road portion lasts 30 to 60 minutes and includes highway driving, city driving, turns, lane changes, and emergency stops. The examiner is looking for smooth control, proper mirror use, safe following distance, and compliance with traffic laws.

If you fail any part of the skills test, you can retake it, but you must schedule another appointment and pay another fee. Some states allow you to retake only the failed portion; others require you to repeat the entire test.

CDL Endorsements and Restrictions

A basic CDL allows you to drive a tractor-trailer or large bus, but certain cargo and vehicle types require additional endorsements — separate credentials added to your license. The most common are Hazmat (hazardous materials), Tanker, Doubles/Triples (multiple trailers), and Passenger. Each endorsement requires passing an additional written test.

Restrictions work the opposite way: they limit what you can do with your CDL. For example, an automatic transmission restriction means you can only drive vehicles with automatic transmissions. A school bus restriction means you cannot drive a school bus even though you hold a CDL. Restrictions are usually added if you fail part of the skills test or if your medical examination shows a limitation.

Some states allow you to test for endorsements at the same time as your main CDL; others require you to pass the main test first, then come back for endorsement tests. Check with your state DMV about the order and timing.

How State Requirements Differ

The federal government sets minimum standards for CDL testing and medical requirements, but states have flexibility in how they administer the program. Some differences you may encounter:

• The GVWR threshold for requiring a CDL ranges from 26,001 pounds in most states to lower thresholds in a few states for certain vehicle types.
• The written test passing score is usually 80%, but some states set it higher.
• Some states allow you to obtain a CDL permit (a temporary credential) after passing the written test, which lets you practice with a licensed driver before taking the skills test. Others do not issue permits.
• The fee for a CDL varies by state, typically ranging from $50 to $200 for the license itself, plus fees for each test attempt and endorsement.
• Some states require a certain number of hours of classroom or behind-the-wheel training before you can test; others do not mandate training, though employers often require it.

Before you start the process, visit your state's DMV website to learn the specific requirements, fees, and testing procedures in your state. You will also find the CDL Manual and a list of approved testing locations.

Training Schools and Employer-Sponsored Programs

Many people obtain their CDL through a commercial driving school rather than studying on their own. A typical school program lasts three to eight weeks and includes classroom instruction on regulations and safety, behind-the-wheel training in a school vehicle, and test preparation. The cost ranges widely — from $3,000 to $15,000 or more depending on the school and program length.

Some schools are affiliated with trucking companies and offer tuition reimbursement or may provide employment after you pass your CDL test. Others are independent and prepare you to test with your state DMV. Attending a school does not change the test itself — you still take the same written and skills tests as anyone else — but it can improve your chances of passing on the first attempt.

If you are already employed by a trucking company, bus company, or other commercial carrier, ask whether they offer CDL training or tuition reimbursement. Some large employers run their own training programs or have partnerships with schools. This can significantly reduce your out-of-pocket cost.

Frequently Asked Questions

Can I get a CDL if I have a medical condition like diabetes or high blood pressure?

Yes, if the condition is controlled or managed. The Medical Examiner is looking for conditions that are uncontrolled or untreated. Bring documentation showing your condition is stable and you are following treatment. Some conditions may result in a one-year certificate instead of two years, requiring more frequent medical renewals.

What happens if I fail the skills test?

You can retake it after scheduling another appointment and paying the test fee again. Some states let you retake only the failed portion; others require the full test. There is no limit on how many times you can retake it, but each attempt costs money and takes time to schedule.

Do I need a CDL to drive a dump truck or cement mixer?

Only if the vehicle's GVWR exceeds your state's threshold — usually 26,001 pounds. Check the vehicle's registration or manufacturer specifications for the GVWR. If it is under the threshold, you can drive it with a regular driver license, though your employer may have their own requirements.

How long does it take to get a CDL from start to finish?

It varies by state and your preparation method. If you study on your own, you might pass the written test in a few weeks, but scheduling the skills test can take another month or more depending on examiner availability. Attending a driving school adds three to eight weeks. Total time is typically two to four months, but can be longer in busy areas.

Can I keep my regular driver license and add a CDL to it?

Yes. Your CDL is an additional credential on top of your regular license. You keep both. If your CDL is suspended or revoked, your regular license remains valid unless it is suspended separately.