Knowledge Test Class B #1
Class B Driving Test | South Carolina 2026 #1 Page 3 of 7
Train for FREE online with our South Carolina 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 SC 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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15 . If planning to drive a vehicle placarded for hazardous materials, you do not need a hazardous materials endorsement.
You must have a CDL with a hazardous materials endorsement to operate a vehicle of any size that is used to transport defined classes of hazardous materials.
16 . What is the average driver’s reaction time?
The average driver has a reaction time between three-quarters of a second and one second. At 55 mph, this corresponds to a distance of 61 feet traveled.
17 . What can happen if the air pressure gets too low in an air brake system?
Pressing and releasing the brake pedal unnecessarily can let air out of the braking system faster than the compressor can replace it. Air brakes may cease to work effectively if the pressure becomes too low.
18 . 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.
19 . A vehicle with air brakes may be driven without an air brake endorsement.
If you do not take or pass the air brakes test, you will be restricted to operating vehicles without air brakes.
20 . An applicant hoping to be a city bus driver needs a passenger endorsement.
All applicants seeking to be licensed to drive a bus must pass the passenger endorsement test.
21 . Mismatched tire sizes are acceptable on the rear axles.
When inspecting a vehicle's tires, you should verify that there are no tires of mismatched sizes.
See the exact questions that will be on the 2026 South Carolina DMV exam.
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2026 South Carolina | Frequently Asked Questions
To secure a CDL Doubles/Triples endorsement in South Carolina, you must first have a Commercial Driver's License (CDL). After that, you need to pass a written knowledge test on handling large vehicles. This test covers topics like coupling and uncoupling, inspecting doubles and triples, and anticipating and handling different driving situations.
To obtain a CDL Doubles/Triples license, you must have a valid Commercial Driver’s License (CDL). Then, you'll need to pass a Doubles/Triples endorsement knowledge test. The test covers topics such as coupling and uncoupling, inspecting doubles and triples, and handling various driving situations. Training or experience driving these types of vehicles is also beneficial.
While it's not required by law, having practical training or experience driving double/triple trailers is highly beneficial and might be required by employers. The CDL Doubles/Triples endorsement primarily requires passing a knowledge test. However, understanding how to handle these large vehicles, including coupling/uncoupling and inspection procedures, is crucial for safety.
Yes, to obtain a CDL Doubles/Triples endorsement in South Carolina, you must pass a written knowledge test. This test covers specific topics related to driving doubles and triples, such as coupling and uncoupling, inspecting these types of vehicles, and handling various driving situations. It's an additional requirement beyond the general CDL license.
The CDL Doubles/Triples endorsement test is primarily a written exam, focusing on knowledge rather than practical skills or maneuvers. It covers areas like coupling and uncoupling, vehicle inspection, and handling specific driving situations. However, practical skills such as maneuvering these vehicles safely can be beneficial, even if not directly tested. Always check with your local DMV for specific requirements.
No, it is not permissible to operate double/triple trailers without a valid CDL Doubles/Triples endorsement in South Carolina. This endorsement is required by law to ensure that drivers have the necessary skills and knowledge to safely operate multiple trailers. Violating this requirement can result in penalties and potential loss of driving privileges.
You can append the CDL Doubles/Triples endorsement to your existing CDL license. You do not need to initiate a new application for a separate license. However, you will need to pass the Doubles/Triples knowledge test, and pay the appropriate fees to add this endorsement to your current CDL license. Always check with your local DMV for specific procedures.
Yes, drivers with a CDL Doubles/Triples endorsement are subject to specific rules and regulations. For instance, they must comply with weight restrictions, follow safety protocols for coupling and uncoupling trailers, and adhere to specific driving techniques. Additionally, they must abide by all general CDL rules, including maintaining a logbook and observing Hours of Service regulations.
In South Carolina, a combination vehicle (like a double or triple trailer) can have a maximum weight of 80,000 lbs. The maximum length for a double trailer is 61 feet for the two trailers combined. For triple trailers, the total combined length is typically limited to 75 feet. However, these restrictions can vary based on local regulations and the specific roadways being used.
Yes, there are specific safety guidelines and regulations in South Carolina for driving double/triple trailers with a CDL Doubles/Triples endorsement. These include maintaining proper following distances, adjusting driving techniques to account for the longer length and increased weight of the combination, and being aware of potential stability issues. It is important to adhere to these guidelines to ensure safe operation of double/triple trailers on the road.
