Knowledge Test Class B #2
Class B Driving Test | District Of Columbia 2026 #2 Page 4 of 7
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.
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22 . To make driving at night easier, you should:
Use only your low beam headlights.
If the interior of your cab is too bright when you are driving at night, you may have difficulty seeing things outside. Keep the interior light off and adjust your instrument lights to the lowest possible level that still allows you to easily read the gauges.
23 . Trailers should:
Be loaded with all the weight directly behind the cab.
Overloading a vehicle is dangerous. It can damage the vehicle and interfere with the driver's ability to control it.
24 . Air tank drains:
Must remain open during driving.
Compressed air in an air brake system usually contains a certain amount of water and compressor oil. The water and oil can damage the brakes if left to accumulate in the system. Manually operated air tank drains must be opened daily to remove this build-up.
25 . If a vehicle has air brakes, the air compressor drive belt should be checked before each drive. In what condition should the belt be?
Bumpy
When inspecting a vehicle with air brakes that has a belt-driven air compressor, you should check the condition and tightness of the belt. It should be in good condition.
26 . If driving in a foggy area, you should not:
Turn on your four-way flashers.
It is safest not to drive in foggy areas. However, if you must drive through fog, you should slow down, use your low beam headlights and fog lights, and turn on your four-way flashers.
27 . Of the following, which is not a way to prevent drowsiness during a trip?
Avoiding medications that may cause drowsiness
Driving while fatigued can be extremely dangerous. Strategies for preventing drowsiness while driving include getting a full night's sleep before a trip; having someone ride with you so you can take turns driving; scheduling trips for times during which you are normally awake; and avoiding medications that may cause drowsiness.
28 . After traveling under an overpass during the driving skills test, you may be asked to recall:
If there was a shoulder near the roadway.
If you drive under an overpass during the on-road driving skills test, your examiner may ask you to recall the posted clearance or height of the overpass.
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2026 District Of Columbia | Frequently Asked Questions
To acquire a CDL Hazmat endorsement in the District of Columbia, you must first hold a valid CDL. Then, pass the Hazardous Materials Knowledge Test at a DMV service location. You'll also need to undergo a federal TSA background check and fingerprinting. Lastly, submit the Hazmat Endorsement Application, proof of U.S. citizenship or legal status, and pay the required fees.
To obtain a CDL Hazmat license, you must already hold a valid Commercial Driver's License (CDL). You also need to pass the Hazardous Materials Knowledge Test, undergo a federal TSA background check, and be fingerprinted. Proof of U.S. citizenship or legal status is required. Lastly, you need to be in good physical health to meet the demands of the job.
When applying for a CDL Hazmat endorsement, you'll need to provide your valid Commercial Driver's License (CDL), proof of U.S. citizenship or legal residency (like a passport or birth certificate), and proof of identity. You'll also need to bring the receipt for your TSA background check and fingerprinting, and complete the Hazmat Endowment Application.
Yes, there is a dedicated written test for the CDL Hazmat endorsement. This test focuses on the rules and safety procedures for handling and transporting hazardous materials. It's essential to study the Hazmat section of your state's CDL manual thoroughly before taking the test to ensure you're well-prepared.
The written test for the CDL Hazmat endorsement covers a range of topics related to hazardous materials. These include identifying hazardous materials, understanding shipping papers, using placards and labels, handling emergencies, loading and unloading procedures, and complying with the relevant safety rules and regulations.
Yes, there are extra charges associated with acquiring a CDL Hazmat endorsement. These include fees for the TSA background check and fingerprinting, which typically cost around $86.50. Additionally, there may be a fee for the endorsement application, which varies by state. It's best to check with your local DMV for specific costs.
Yes, obtaining a CDL Hazmat endorsement requires a mandatory background check and fingerprinting conducted by the Transportation Security Administration (TSA). This ensures the individual doesn't pose a security threat and is part of the federal safety regulations for handling hazardous materials.
Yes, specialized training is mandatory for the CDL Hazmat endorsement. Applicants must pass a written test that covers the regulations and requirements for transporting hazardous materials. After passing the test, they receive a certification, which is the Hazmat endorsement on their Commercial Driver's License (CDL). This ensures they are knowledgeable about handling hazardous materials safely.
No, you cannot legally transport hazardous materials without a valid CDL Hazmat endorsement. This endorsement ensures that you have the necessary knowledge and skills to handle hazardous materials safely. Driving without it can result in serious penalties, including fines and suspension of your commercial driver's license.
Yes, you can add a Hazmat endorsement to your existing CDL. You don't need to apply for a new CDL. However, you must pass a written Hazmat knowledge test, submit to a TSA background check, and pay the associated fees. Once these steps are completed successfully, the Hazmat endorsement will be added to your CDL.
