Knowledge Test Class A #1
Class A Driving Test | District Of Columbia 2026 #1 Page 4 of 7
Train for FREE online with our District Of Columbia class A 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 A 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 A requirements may vary from state to state.
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22 . When a vehicle is started, warning lights and buzzers:
Should not come on.
After an engine is started, the warning lights and buzzers for oil, coolant, charging circuits, and the Anti-Lock Braking System (ABS) should go out right away.
23 . Too little weight on a steering axle can result in:
Improved gas mileage.
The weight of cargo in a vehicle needs to be balanced appropriately so that it does not interfere with the vehicle's safe handling. For example, if cargo is placed too far to the rear of a vehicle, the front axle will be under-weighted and the front wheels may not have enough traction for the driver to steer safely.
24 . How many daily hours of sleep does an adult need to maintain alertness?
Four to five
Being properly rested is essential to the safe operation of a CMV. To maintain alertness, most people need eight to nine hours of sleep per night.
25 . Sometimes, when checking the automatic transmission fluid level:
Your vehicle may have to be left running.
In some vehicles, you may have to leave the engine running to check the automatic transmission fluid level.
26 . While driving:
A driver should always use turn signals to inform others of their intentions.
It is essential that a driver always uses proper signals to make their intentions known to others on the road.
27 . Brakes can get out of adjustment:
If brakes on one side are used more often than brakes on the other side.
Brakes are particularly prone to getting out out adjustment if they are hot. Use proper braking techniques to avoid letting your brakes overheat.
28 . What is a danger of rolling back when you start to accelerate?
You may lose your position in traffic.
To avoid hitting someone or something behind you, it is important to ensure that your vehicle does not roll backwards when starting from a stop. If your vehicle has a manual transmission, partly engage the clutch before taking your foot off the brake.
2026 District Of Columbia | Frequently Asked Questions
A CDL Class B license in the District of Columbia authorizes the holder to operate vehicles with a Gross Vehicle Weight Rating (GVWR) of 26,001 pounds or more, or any such vehicle towing another not in excess of 10,000 pounds. This includes buses, dump trucks, delivery trucks, and other medium to heavy commercial vehicles.
A Class B CDL license in the District of Columbia allows the holder to operate single vehicles with a Gross Vehicle Weight Rating of 26,001 pounds or more, or any such vehicle towing another not exceeding 10,000 pounds. This includes buses, dump trucks, segmented buses, delivery trucks, and utility trucks.
To acquire a Class B CDL license in District of Columbia, you must be at least 21 years old, possess a valid DC driver's license, pass a vision test, and complete a commercial driver's license application. You'll also need to pass a general knowledge test and a skills test, which includes a pre-trip vehicle inspection, a basic control skills test, and an on-road driving test.
In the District of Columbia, you must be at least 21 years old to qualify for a Class B CDL license. This is the age requirement set by the Federal Motor Carrier Safety Administration for interstate travel. However, some states may allow individuals aged 18 and above to drive within that state's borders.
While not always necessary, specific endorsements can expand the types of vehicles you can operate with a Class B CDL license in the District of Columbia. These include passenger vehicles (P), school buses (S), and tank vehicles (N). Each endorsement requires additional testing.
The Class B CDL skills assessment in the District of Columbia encompasses three main parts: a pre-trip vehicle inspection, a basic vehicle control test, and an on-road driving test. These tests assess your ability to inspect your vehicle, control its basic functions, and drive it safely on the road.
Yes, Class B CDL license holders in the District of Columbia are limited to operating vehicles with a Gross Vehicle Weight Rating (GVWR) of 26,001 pounds or more. They can also tow trailers that weigh less than 10,000 pounds. They cannot operate Class A vehicles without the appropriate endorsement.
Yes, in the District of Columbia, the written Class B CDL test is available in several languages other than English. However, federal regulations require all CDL holders to read and speak English sufficiently to converse with the general public, understand highway traffic signs and signals, respond to official inquiries, and make entries on reports and records.
Yes, in the District of Columbia, test accommodations for people with disabilities are available for the Class B CDL written exam. You can request accommodations through the DC Department of Motor Vehicles. However, you need to provide supporting documentation of your disability to qualify for these accommodations.
Yes, if you don't pass the Class B CDL written test in the District of Columbia, you can retake it. However, you must wait at least three business days before retesting. If you fail six times within a year, you'll have to wait one year from the date of the last test before retaking it.