Class B Driving Test | District Of Columbia 2026 #2

Train for FREE online with our District Of Columbia class B license test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a DC CDL class B permit in 2026, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that CDL class B requirements may vary from state to state.

Number of Question 50

Passing Score 40

Number of Tests 20

1 . During a static leakage test, the maximum leakage rate for a single vehicle with air brakes is ____ in one minute.

1 psi

2 psi

3 psi

4 psi

When performing a static leakage test on a single vehicle with air brakes, the leakage rate should be no more than 2 psi in a minute. If air leaks from the air brake system at a quicker rate, the vehicle should not be driven because something likely needs to be repaired.

2 . What can change the height of a vehicle?

Color

Length

Weight

Number of windows

The added weight of a heavy load will make a vehicle sit lower than usual. A vehicle will often be taller when carrying a light load than when carrying a heavy load. If your vehicle fits under an overpass while carrying a full load, it is not guaranteed that it will fit under the same overpass if it is empty.

3 . When stopping, the brake pedal:

Should be pressed down quickly.

Should be pressed down gradually.

Should be lifted up quickly.

Should be lifted up gradually.

When stopping, the brake pedal should be pushed down gradually. Control the pressure so your vehicle comes to a slow, safe stop.

4 . Most drivers are the least alert:

In the morning.

In cold weather.

At night.

After work.

Fatigue and lack of alertness are major hazards when driving at night. Most people are the least alert at night, especially after midnight.

5 . What should happen if the air pressure in the braking system's air tanks falls below 60 psi?

The warning light will come on.

The vehicle will not shift out of gear.

The front lights will flash.

The steering wheel will lock up.

On vehicles with air brakes, a low air pressure warning signal will come on if the pressure in the air tanks falls below 60 psi. On large buses, the signal may activate at 80 to 85 psi.

6 . Dry bulk tanks:

Usually have low centers of gravity.

Usually have high centers of gravity.

Usually are not allowed to cross railroad tracks.

Cannot be driven on interstates.

Dry bulk tanks require special care when being driven because they have high centers of gravity. Drivers should also be careful because the materials being carried can easily shift in transit, causing a change in the vehicle's handling.

7 . Belts in the engine compartment should be:

Frayed.

Tight.

Greasy.

Easy to slide off.

When inspecting your vehicle's engine, check the belts for tightness and excessive wear. The amount of "give" that is safe for each belt in a given engine will vary, so learn what is appropriate for your vehicle.

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2026 District Of Columbia | Frequently Asked Questions

To acquire a CDL Passenger endorsement in the District of Columbia, you must first hold a valid CDL. You then need to pass a written passenger endorsement test and a skills test in a vehicle similar to the one you'll be driving. The test covers topics like vehicle inspection, loading/unloading passengers, and emergency procedures.

To obtain a CDL Passenger license in the District of Columbia, an applicant must possess a valid CDL, pass the Passenger Transport written test, complete a Federal Motor Carrier Safety Administration medical examination, and successfully pass a skills test in the type of vehicle similar to the one they will be driving. The applicant must also be at least 21 years old.

Yes, specific training is necessary to earn a CDL Passenger endorsement in the District of Columbia. You must pass a written passenger endorsement test and a skills test in a vehicle similar to the one you'll be driving. While not mandatory, practical experience driving similar vehicles can be beneficial for passing the skills test.

Yes, to secure a CDL Passenger endorsement in the District of Columbia, you are required to pass a written passenger endorsement test. This test covers topics such as vehicle inspection, loading/unloading passengers, and emergency procedures. It is designed to ensure you have the necessary knowledge to safely operate a passenger vehicle.

During the CDL Passenger endorsement skills test, you'll need to demonstrate your ability to safely operate a passenger vehicle. This includes pre-trip vehicle inspection, proper use of mirrors and signals, safe lane changes and turns, proper loading/unloading procedures, and emergency protocol. Your ability to control and maneuver the vehicle in various traffic situations will also be assessed.

No, it is illegal to transport passengers without holding a valid CDL Passenger endorsement in the District of Columbia. A CDL Passenger endorsement is required to operate a commercial vehicle that is designed to transport 16 or more passengers, including the driver. Failure to have the proper endorsement can result in fines and penalties.

Yes, you can add the CDL Passenger endorsement to your existing commercial driver's license. You don't need a new application. However, you must pass the Passenger endorsement written test and a skills test in a passenger vehicle. Remember to bring your current CDL to the DMV when you go for your tests.

Yes, there are specific restrictions for drivers with a CDL Passenger endorsement. For instance, you cannot transport more passengers than your vehicle is designed to carry. Additionally, you are subject to stricter blood alcohol content (BAC) limits and may be disqualified for serious traffic violations or multiple minor violations.

Yes, there are age-related prerequisites and limitations for acquiring the CDL Passenger endorsement in the District of Columbia. To obtain the endorsement, you must be at least 18 years old. However, if you plan to transport passengers across state lines or operate a vehicle with hazardous materials, you must be at least 21 years old. Additionally, certain medical and physical requirements must be met to qualify for the endorsement.

With a CDL Passenger endorsement, you'll be eligible to operate vehicles such as buses, shuttles, or any other vehicle designed to transport 16 or more passengers, including the driver. This includes school buses if you also have a School Bus endorsement. It's important to note that the specific vehicle must match the class of your CDL.