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Double Triple Test | South Carolina 2026 #1 Page 3 of 3
Train for FREE with our South Carolina CDL double triple practice test online. 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 double triple license 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 DMV requirements may vary from state to state.
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15 . If brakes fail on a long downgrade, the driver should:
If your brakes fail on a downgrade, your best option is to use an escape ramp. If no escape ramp is available, it is a good idea to look for a different escape route, such as a side road or open field.
16 . How much water needs to be on the surface of a road for a vehicle to hydroplane?
None
Hydroplaning is an effect in which a vehicle's tires lose traction with the surface of the road and instead glide along a layer of water. There does not have to be much water on the road for this to occur.
17 . Which of the following is not an example of a distracted person that motorists should be worried about?
A person sitting on a bench waiting for a bus
You should be cautious when you are near people who are not paying attention to the road. Be wary of drivers who are engaged in conversation with passengers, children near the road, and road workers.
18 . In a vehicle with dual air brakes, a leak in one system ____ the second system.
A dual air brake system is made up of two separate air brake systems. If there is an air leak in one system, it may not affect the other.
19 . How many daily hours of sleep does an adult need to maintain alertness?
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.
20 . You should always be able to stop within:
One minute of hitting the brakes.
It is essential that your vehicle will be able to stop within the area of the road that you are able to see. This means that you must slow down whenever conditions reduce visibility.
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.