Double
This endorsement is required if the driver will pull two or three trailers. To receive this endorsement, applicants must pass a test. The test consists of 20 multiple choice questions. To pass, the applicant must answer at least 16 questions correctly. Each question has three or four possible answer choices. Test questions come from the North Carolina Commercial Driver License Manual. Questions come from chapters covering: Driving Safely, Air Brakes (if applicable), Combination Vehicles and Doubles and Triples. The Double/Triple endorsement can be used with the Class A CDL.
Number of Question
Passing Score
15. To inspect slack adjusters on S-cam brakes, you need to:
Explanation
Check each slack adjuster after parking on level ground, setting wheel chocks, and disengaging the parking brake. Pull the slack adjusters to make sure they do not move more than about one inch from where the push rod is attached. If they move more than one inch, they may be out of adjustment and will need to be fixed.
16. The application pressure gauge:
Explanation
In an air brake system, the application pressure gauge shows how much air pressure is being applied to the brakes. Not all vehicles with an air brake system have this gauge.
17. When only the tractor is equipped with an Anti-Lock Braking System (ABS):
Explanation
If a tractor is equipped with an Anti-Lock Braking System (ABS) but the trailer is not, the risk of jackknifing will be reduced and the driver should still be able to maintain steering control. If only the trailer is equipped with ABS, it is less likely that the trailer will swing out to one side.
18. During a static leakage test, what is the maximum leakage rate that is safe for a double combination vehicle?
Explanation
When performing a static leakage test on a double combination vehicle with air brakes, the leakage rate should be no more than 3 psi in one minute. If the air leaks from the air brake system at a quicker rate, the vehicle should not be driven because something likely needs to be repaired.
19. If a trailer is too high:
Explanation
Before coupling together a tractor and a trailer, you should make sure the trailer is at the proper height. If the trailer is too low, the trailer nose may be damaged. If the trailer is too high, it may not be able to couple correctly.
20. Starting in which year were newly manufactured trailers required to have ABS?
Explanation
All trailers and converter dollies manufactured on or after March 1, 1998 must be equipped with Anti-Lock Braking Systems (ABS).
Frequently Asked Questions
To obtain a CDL Doubles/Triples endorsement in North Carolina, follow these steps:
1. Determine if you meet the eligibility requirements: You must hold a current North Carolina commercial driver's license (CDL) and pass a knowledge test specific to the Doubles/Triples endorsement.
2. Study the North Carolina Commercial Driver License Manual: The manual covers the information you need to know to pass the knowledge test. You can obtain a copy of the manual online or at any North Carolina DMV office.
3. Schedule an appointment to take the knowledge test: You can schedule an appointment online or by calling your local North Carolina DMV office. Be sure to bring your current CDL and any applicable fees.
4. Take and pass the knowledge test: The knowledge test covers topics such as coupling and uncoupling, inspecting doubles and triples, and safe driving practices for operating vehicles with multiple trailers.
5. Pay any applicable fees: There may be fees associated with obtaining the Doubles/Triples endorsement. Check with your local DMV for specific fee information.
6. Update your CDL: Once you have passed the knowledge test and paid any applicable fees, your CDL will be updated to include the Doubles/Triples endorsement.
7. Practice safe driving: Remember to always practice safe driving techniques when operating a vehicle with multiple trailers, including keeping a safe distance from other vehicles and adjusting your driving habits based on road conditions.
Note: It is important to note that certain medical conditions may disqualify you from obtaining a CDL or specific endorsements. Be sure to check with your healthcare provider and local DMV for any medical requirements or restrictions before pursuing a CDL or endorsement.
1. Determine if you meet the eligibility requirements: You must hold a current North Carolina commercial driver's license (CDL) and pass a knowledge test specific to the Doubles/Triples endorsement.
2. Study the North Carolina Commercial Driver License Manual: The manual covers the information you need to know to pass the knowledge test. You can obtain a copy of the manual online or at any North Carolina DMV office.
3. Schedule an appointment to take the knowledge test: You can schedule an appointment online or by calling your local North Carolina DMV office. Be sure to bring your current CDL and any applicable fees.
4. Take and pass the knowledge test: The knowledge test covers topics such as coupling and uncoupling, inspecting doubles and triples, and safe driving practices for operating vehicles with multiple trailers.
5. Pay any applicable fees: There may be fees associated with obtaining the Doubles/Triples endorsement. Check with your local DMV for specific fee information.
6. Update your CDL: Once you have passed the knowledge test and paid any applicable fees, your CDL will be updated to include the Doubles/Triples endorsement.
7. Practice safe driving: Remember to always practice safe driving techniques when operating a vehicle with multiple trailers, including keeping a safe distance from other vehicles and adjusting your driving habits based on road conditions.
Note: It is important to note that certain medical conditions may disqualify you from obtaining a CDL or specific endorsements. Be sure to check with your healthcare provider and local DMV for any medical requirements or restrictions before pursuing a CDL or endorsement.
To get a CDL Doubles/Triples license in North Carolina, you must meet the following requirements:
1. Be at least 18 years of age: You must be at least 18 years old to operate a commercial vehicle within the state of North Carolina. However, you must be at least 21 years old to operate a commercial vehicle across state lines or transport hazardous materials.
2. Hold a valid North Carolina CDL: You must already have a valid North Carolina commercial driver's license before seeking the Doubles/Triples endorsement.
3. Pass a knowledge test: You must pass a knowledge test specific to the Doubles/Triples endorsement. The test covers topics such as coupling and uncoupling, inspecting doubles and triples, and safe driving practices for operating vehicles with multiple trailers.
4. Pay applicable fees: There may be fees associated with obtaining the Doubles/Triples endorsement. Check with your local DMV for specific fee information.
5. Meet medical requirements: You must meet certain medical requirements to obtain and maintain a CDL in North Carolina. These requirements include passing a medical exam and maintaining a valid medical certificate.
6. Have a clean driving record: You must have a clean driving record with no major traffic violations in the past three years.
It is important to note that these requirements may vary depending on your individual circumstances and the type of commercial vehicle you will be operating. Be sure to check with your local DMV for any additional requirements or restrictions before pursuing a CDL Doubles/Triples license.
1. Be at least 18 years of age: You must be at least 18 years old to operate a commercial vehicle within the state of North Carolina. However, you must be at least 21 years old to operate a commercial vehicle across state lines or transport hazardous materials.
2. Hold a valid North Carolina CDL: You must already have a valid North Carolina commercial driver's license before seeking the Doubles/Triples endorsement.
3. Pass a knowledge test: You must pass a knowledge test specific to the Doubles/Triples endorsement. The test covers topics such as coupling and uncoupling, inspecting doubles and triples, and safe driving practices for operating vehicles with multiple trailers.
4. Pay applicable fees: There may be fees associated with obtaining the Doubles/Triples endorsement. Check with your local DMV for specific fee information.
5. Meet medical requirements: You must meet certain medical requirements to obtain and maintain a CDL in North Carolina. These requirements include passing a medical exam and maintaining a valid medical certificate.
6. Have a clean driving record: You must have a clean driving record with no major traffic violations in the past three years.
It is important to note that these requirements may vary depending on your individual circumstances and the type of commercial vehicle you will be operating. Be sure to check with your local DMV for any additional requirements or restrictions before pursuing a CDL Doubles/Triples license.
Yes, you will need specific training and experience to obtain a CDL Doubles/Triples endorsement in North Carolina. The Federal Motor Carrier Safety Administration (FMCSA) requires all commercial drivers operating vehicles with multiple trailers to complete specialized training and pass a skills test.
Here are the requirements for training and experience:
1. Complete a CDL training program: You must complete a CDL training program that includes instruction on operating vehicles with multiple trailers. Training programs may be offered by private companies or community colleges.
2. Receive behind-the-wheel training: You must receive behind-the-wheel training on operating vehicles with multiple trailers. This training must be provided by a qualified instructor or employer.
3. Pass a skills test: You must pass a skills test that includes both a pre-trip inspection and an on-road driving test with multiple trailers.
4. Obtain a learner's permit: Before receiving behind-the-wheel training, you must obtain a learner's permit and be accompanied by a qualified instructor or employer.
It is important to note that these requirements may vary depending on your individual circumstances and the type of commercial vehicle you will be operating. Be sure to check with your local DMV for any additional requirements or restrictions before pursuing a CDL Doubles/Triples endorsement.
Here are the requirements for training and experience:
1. Complete a CDL training program: You must complete a CDL training program that includes instruction on operating vehicles with multiple trailers. Training programs may be offered by private companies or community colleges.
2. Receive behind-the-wheel training: You must receive behind-the-wheel training on operating vehicles with multiple trailers. This training must be provided by a qualified instructor or employer.
3. Pass a skills test: You must pass a skills test that includes both a pre-trip inspection and an on-road driving test with multiple trailers.
4. Obtain a learner's permit: Before receiving behind-the-wheel training, you must obtain a learner's permit and be accompanied by a qualified instructor or employer.
It is important to note that these requirements may vary depending on your individual circumstances and the type of commercial vehicle you will be operating. Be sure to check with your local DMV for any additional requirements or restrictions before pursuing a CDL Doubles/Triples endorsement.
Yes, to obtain a CDL Doubles/Triples endorsement in North Carolina, you must pass a written knowledge test specific to the Doubles/Triples endorsement. The test covers topics such as coupling and uncoupling, inspecting doubles and triples, and safe driving practices for operating vehicles with multiple trailers.
In addition to the Doubles/Triples endorsement test, you may also need to take other written tests or exams depending on the type of commercial vehicle you will be operating. For example, if you plan to transport hazardous materials, you will need to pass a hazardous materials endorsement test.
It is important to note that in order to obtain a CDL Doubles/Triples endorsement, you must already have a valid North Carolina commercial driver's license (CDL). This means that you must have already passed the general knowledge test and any other required tests for your initial CDL license.
Be sure to check with your local DMV for specific information on testing requirements for obtaining a CDL Doubles/Triples endorsement in North Carolina.
In addition to the Doubles/Triples endorsement test, you may also need to take other written tests or exams depending on the type of commercial vehicle you will be operating. For example, if you plan to transport hazardous materials, you will need to pass a hazardous materials endorsement test.
It is important to note that in order to obtain a CDL Doubles/Triples endorsement, you must already have a valid North Carolina commercial driver's license (CDL). This means that you must have already passed the general knowledge test and any other required tests for your initial CDL license.
Be sure to check with your local DMV for specific information on testing requirements for obtaining a CDL Doubles/Triples endorsement in North Carolina.
To obtain a CDL Doubles/Triples endorsement in North Carolina, you must pass a skills test that includes both a pre-trip inspection and an on-road driving test with multiple trailers. Here are the specific maneuvers that you may be asked to demonstrate during the on-road test:
1. Coupling and uncoupling: You will be asked to demonstrate proper coupling and uncoupling procedures for multiple trailers, including checking the connections, air lines, and electrical lines.
2. Straight-line backing: You will be asked to back up your vehicle in a straight line for a specified distance.
3. Offset backing: You will be asked to back your vehicle into a space offset to the left or right of your starting position.
4. Parallel parking: You will be asked to park your vehicle in a space parallel to the curb.
5. Alley dock: You will be asked to back your vehicle into an alley dock, which simulates a loading dock or other confined space.
6. On-road driving: You will be asked to drive your vehicle on public roads while pulling multiple trailers, demonstrating safe driving practices such as turning, merging, and braking.
During the test, you will be evaluated on your ability to perform these maneuvers safely and effectively, as well as your overall control of the vehicle. Be sure to practice these maneuvers extensively before taking the test, and follow all safety guidelines and regulations for operating vehicles with multiple trailers.
1. Coupling and uncoupling: You will be asked to demonstrate proper coupling and uncoupling procedures for multiple trailers, including checking the connections, air lines, and electrical lines.
2. Straight-line backing: You will be asked to back up your vehicle in a straight line for a specified distance.
3. Offset backing: You will be asked to back your vehicle into a space offset to the left or right of your starting position.
4. Parallel parking: You will be asked to park your vehicle in a space parallel to the curb.
5. Alley dock: You will be asked to back your vehicle into an alley dock, which simulates a loading dock or other confined space.
6. On-road driving: You will be asked to drive your vehicle on public roads while pulling multiple trailers, demonstrating safe driving practices such as turning, merging, and braking.
During the test, you will be evaluated on your ability to perform these maneuvers safely and effectively, as well as your overall control of the vehicle. Be sure to practice these maneuvers extensively before taking the test, and follow all safety guidelines and regulations for operating vehicles with multiple trailers.
No, in North Carolina, you cannot operate double or triple trailers without a CDL Doubles/Triples endorsement. To operate a commercial vehicle with multiple trailers, you must have a valid CDL with the Doubles/Triples endorsement.
It is important to note that the requirements for obtaining a CDL Doubles/Triples endorsement vary by state. In North Carolina, you must pass a written knowledge test specific to the Doubles/Triples endorsement and a skills test that includes both a pre-trip inspection and an on-road driving test with multiple trailers.
Operating a commercial vehicle without the proper endorsements or licenses can result in fines, suspension or revocation of your CDL, and other penalties. It is important to ensure that you have the proper endorsements and licenses before operating any commercial vehicle.
It is important to note that the requirements for obtaining a CDL Doubles/Triples endorsement vary by state. In North Carolina, you must pass a written knowledge test specific to the Doubles/Triples endorsement and a skills test that includes both a pre-trip inspection and an on-road driving test with multiple trailers.
Operating a commercial vehicle without the proper endorsements or licenses can result in fines, suspension or revocation of your CDL, and other penalties. It is important to ensure that you have the proper endorsements and licenses before operating any commercial vehicle.
In North Carolina, you can add the CDL Doubles/Triples endorsement to your existing CDL license. To add the endorsement, you must pass a written knowledge test specific to the Doubles/Triples endorsement and a skills test that includes both a pre-trip inspection and an on-road driving test with multiple trailers.
To add the endorsement to your license, you will need to visit a North Carolina DMV office and bring the following documents:
1. Your current CDL license
2. Proof of citizenship or lawful presence
3. Proof of North Carolina residency
4. Your Social Security card
5. Medical certificate
You will also need to pass a vision test and pay the required fees for the endorsement.
It is important to note that adding an endorsement to your CDL license may require additional training or experience, depending on your current qualifications and driving record. Be sure to consult with your employer and/or a reputable driving school or training program to ensure that you have the necessary skills and knowledge before taking the endorsement test.
To add the endorsement to your license, you will need to visit a North Carolina DMV office and bring the following documents:
1. Your current CDL license
2. Proof of citizenship or lawful presence
3. Proof of North Carolina residency
4. Your Social Security card
5. Medical certificate
You will also need to pass a vision test and pay the required fees for the endorsement.
It is important to note that adding an endorsement to your CDL license may require additional training or experience, depending on your current qualifications and driving record. Be sure to consult with your employer and/or a reputable driving school or training program to ensure that you have the necessary skills and knowledge before taking the endorsement test.
Yes, there are restrictions and limitations for drivers with a CDL Doubles/Triples endorsement in North Carolina.
The most important restriction is that you can only operate commercial vehicles that have multiple trailers attached. This means that if you are driving a single trailer commercial vehicle, you cannot use your CDL Doubles/Triples endorsement.
In addition, some states may have specific weight or length restrictions for commercial vehicles with multiple trailers, and it is important to be aware of these restrictions when operating in different states.
It is also important to note that operating a commercial vehicle with multiple trailers requires additional skills and experience, and it is important to receive proper training before attempting to operate these vehicles.
Finally, all CDL holders are subject to federal and state regulations regarding hours of service, drug and alcohol testing, and other safety requirements. It is important to be aware of these regulations and comply with them at all times when operating a commercial vehicle with multiple trailers.
The most important restriction is that you can only operate commercial vehicles that have multiple trailers attached. This means that if you are driving a single trailer commercial vehicle, you cannot use your CDL Doubles/Triples endorsement.
In addition, some states may have specific weight or length restrictions for commercial vehicles with multiple trailers, and it is important to be aware of these restrictions when operating in different states.
It is also important to note that operating a commercial vehicle with multiple trailers requires additional skills and experience, and it is important to receive proper training before attempting to operate these vehicles.
Finally, all CDL holders are subject to federal and state regulations regarding hours of service, drug and alcohol testing, and other safety requirements. It is important to be aware of these regulations and comply with them at all times when operating a commercial vehicle with multiple trailers.
In North Carolina, the maximum weight allowed for double/triple trailers with a CDL Doubles/Triples endorsement is 80,000 pounds, which is the same as the weight limit for single trailer commercial vehicles.
However, there are federal length restrictions for commercial vehicles with multiple trailers, which are designed to ensure safety on the roads. According to federal regulations, the maximum length for double trailer combinations is 28 feet for each trailer and a total of 63 feet overall. For triple trailer combinations, each trailer can be up to 28 feet long and the total length cannot exceed 75 feet.
It is important to note that different states may have different weight and length restrictions for commercial vehicles with multiple trailers. Before operating a commercial vehicle with multiple trailers in a different state, it is important to research and comply with the specific regulations in that state.
However, there are federal length restrictions for commercial vehicles with multiple trailers, which are designed to ensure safety on the roads. According to federal regulations, the maximum length for double trailer combinations is 28 feet for each trailer and a total of 63 feet overall. For triple trailer combinations, each trailer can be up to 28 feet long and the total length cannot exceed 75 feet.
It is important to note that different states may have different weight and length restrictions for commercial vehicles with multiple trailers. Before operating a commercial vehicle with multiple trailers in a different state, it is important to research and comply with the specific regulations in that state.
Yes, there are specific safety considerations and regulations for driving double/triple trailers with a CDL Doubles/Triples endorsement in North Carolina.
Here are some of the most important ones:
1. Proper training: Before driving a commercial vehicle with multiple trailers, it is important to receive proper training and certification. This includes both classroom and behind-the-wheel instruction, as well as a demonstration of proficiency in handling multiple trailers.
2. Vehicle inspection: Drivers must inspect their vehicle before each trip to ensure that it is safe to operate. This includes checking the brakes, tires, lights, coupling devices, and other components of the vehicle.
3. Weight distribution: When loading cargo onto a commercial vehicle with multiple trailers, it is important to distribute the weight evenly across all trailers. Uneven weight distribution can cause instability and increase the risk of accidents.
4. Speed control: Commercial vehicles with multiple trailers have a higher risk of rollover due to their length and weight. It is important to drive at a safe speed and slow down when turning or taking curves.
5. Following distance: Drivers should maintain a greater following distance when driving a commercial vehicle with multiple trailers, as they require more space to stop.
6. Use of mirrors: Proper use of mirrors is essential when driving a commercial vehicle with multiple trailers. Drivers should use their mirrors to monitor their blind spots and ensure that all trailers are following safely.
7. Compliance with regulations: All CDL holders are subject to federal and state regulations regarding hours of service, drug and alcohol testing, and other safety requirements. It is important to be aware of these regulations and comply with them at all times when operating a commercial vehicle with multiple trailers.
By following these safety considerations and regulations, drivers can help ensure that they operate commercial vehicles with multiple trailers safely and responsibly.
Here are some of the most important ones:
1. Proper training: Before driving a commercial vehicle with multiple trailers, it is important to receive proper training and certification. This includes both classroom and behind-the-wheel instruction, as well as a demonstration of proficiency in handling multiple trailers.
2. Vehicle inspection: Drivers must inspect their vehicle before each trip to ensure that it is safe to operate. This includes checking the brakes, tires, lights, coupling devices, and other components of the vehicle.
3. Weight distribution: When loading cargo onto a commercial vehicle with multiple trailers, it is important to distribute the weight evenly across all trailers. Uneven weight distribution can cause instability and increase the risk of accidents.
4. Speed control: Commercial vehicles with multiple trailers have a higher risk of rollover due to their length and weight. It is important to drive at a safe speed and slow down when turning or taking curves.
5. Following distance: Drivers should maintain a greater following distance when driving a commercial vehicle with multiple trailers, as they require more space to stop.
6. Use of mirrors: Proper use of mirrors is essential when driving a commercial vehicle with multiple trailers. Drivers should use their mirrors to monitor their blind spots and ensure that all trailers are following safely.
7. Compliance with regulations: All CDL holders are subject to federal and state regulations regarding hours of service, drug and alcohol testing, and other safety requirements. It is important to be aware of these regulations and comply with them at all times when operating a commercial vehicle with multiple trailers.
By following these safety considerations and regulations, drivers can help ensure that they operate commercial vehicles with multiple trailers safely and responsibly.
