# 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..

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 Commercial Driver Guide. 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

### 8. What is traction?

Explanation
Traction is friction between your tires and the surface of the road. Adequate traction is necessary for braking and steering.

### 9. When testing ____, you should apply your vehicle's brakes with the hand control while moving the vehicle forward slowly.

Explanation
To test the trailer service brakes, you should first ensure that the braking system has a normal air pressure level, then release the parking brake. You should then move the vehicle forward slowly and apply the brakes with the hand control. If the trailer service brakes are working properly, you will feel the brakes activate.

### 10. How much space should be between the upper and lower fifth wheel?

Explanation
Before a trip, be sure to inspect all couplings. There should be no space between the upper and lower fifth wheel.

### 11. In a vehicle with dual air brakes, a leak in one system ____ the second system.

Explanation
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.

### 12. Once the air tanks are at an air pressure level of 125 psi, the air compressor governor will:

Explanation
An air compressor governor will stop the compressor from pumping air once the air tanks are at an air pressure level around 125 psi. This air pressure level is referred to as the "cut-out" level.

### 13. If something is found to be unsafe during a pre-trip inspection, you should:

Explanation
If a pre-trip inspection reveals anything unsafe about your vehicle, you must get it repaired. It is illegal to operate an unsafe vehicle.

### 14. Accelerating roughly is:

Explanation
When accelerating, speed up smoothly and gradually so your vehicle does not jerk. Rough acceleration can cause mechanical damage.

To obtain a CDL Doubles/Triples endorsement in Tennessee, follow these steps:

1. Obtain a Tennessee Commercial Driver License (CDL) by passing all required written and skills tests.
2. Meet the eligibility requirements for a Doubles/Triples endorsement, including having a valid medical certificate and passing a background check.
3. Study the Tennessee CDL Manual and specifically review the section on Doubles/Triples.
4. Schedule an appointment at a Tennessee Department of Safety and Homeland Security (TDOSHS) Driver License Center to take the Doubles/Triples endorsement written test.
5. Pay the required fee for the endorsement test.
6. Pass the written test with a score of at least 80%.
7. If you pass the test, pay the required fee for the endorsement to be added to your CDL.

It is important to note that you must already have a valid CDL before applying for a Doubles/Triples endorsement, and that this endorsement is only valid for vehicles with double or triple trailers.
To obtain a CDL Doubles/Triples license in Tennessee, you must meet the following requirements:

1. Be at least 18 years of age to drive within the state of Tennessee, and at least 21 years of age to drive across state lines or transport hazardous materials.
2. Hold a valid Tennessee Commercial Driver License (CDL).
3. Have a valid medical certificate.
4. Pass a background check.
5. Pass the Doubles/Triples written test by answering at least 80% of the questions correctly.
6. Pay the required fees for the endorsement test and for adding the endorsement to your CDL.

It is important to note that to operate vehicles with double or triple trailers, you must have a Doubles/Triples endorsement added to your CDL. This endorsement is separate from the CDL itself and requires passing a written test specific to double and triple trailer operation.
Yes, to obtain a CDL Doubles/Triples endorsement in Tennessee, you must have specific experience and training.

Before taking the written test for the Doubles/Triples endorsement, you must already have a valid CDL. To operate vehicles with double or triple trailers, you must also have specific training and experience related to double and triple trailer operation.

The Federal Motor Carrier Safety Administration (FMCSA) has established specific requirements for training and experience for drivers who want to operate vehicles with double or triple trailers. These requirements include:

1. Holding a valid CDL for at least two years.
2. Successfully completing a driver-training program that includes instruction on double and triple trailer operation.
3. Having at least six months of experience operating a commercial motor vehicle with a single trailer before operating vehicles with double or triple trailers.
4. Passing a road test in a vehicle with double or triple trailers.

It is important to note that these requirements are in addition to the written test required to obtain the Doubles/Triples endorsement on your CDL.
Yes, to obtain a CDL Doubles/Triples endorsement in Tennessee, you must pass an additional written test specifically for double and triple trailer operation. This test covers topics such as:

1. Inspecting double/triple trailers: This includes understanding the additional components of double/triple trailers and being able to identify potential safety issues.
2. Coupling and uncoupling double/triple trailers: This covers the proper procedures for hooking up and unhooking multiple trailers.
3. Driving double/triple trailers: This includes understanding the unique handling characteristics of vehicles with multiple trailers, such as turning, backing up, and stopping.
4. Emergency situations: This covers how to handle emergency situations while operating vehicles with multiple trailers.

To obtain the Doubles/Triples endorsement, you must answer at least 80% of the questions correctly on this written exam. Additionally, you must already hold a valid CDL before taking this exam.
To obtain a CDL Doubles/Triples endorsement in Tennessee, you must pass a skills test that includes specific maneuvers related to double and triple trailer operation. The skills test includes the following:

1. Vehicle inspection: You will need to inspect the double/triple vehicle combination and identify any potential safety hazards or defects.

2. Coupling: You will need to correctly couple the double/triple combination, using proper safety procedures and techniques.

3. Driving: You will need to demonstrate the ability to safely operate the double/triple combination vehicle on public roads. This includes making turns, changing lanes, accelerating, and braking safely.

4. Straight line backing: You will need to back the double/triple combination vehicle in a straight line for a distance of 50 feet.

5. Offset backing: You will need to back the double/triple combination vehicle into an alley on your right or left side.

6. Parallel parking: You will need to park the double/triple combination vehicle in a parallel parking space.

7. Alley docking: You will need to back the double/triple combination vehicle into an alley and come to a complete stop within a defined boundary.

During the skills test, you must demonstrate safe driving practices and accuracy while performing these maneuvers. You will be evaluated on your ability to complete the maneuvers correctly, while following safety procedures and maintaining control of the vehicle at all times.
No, in Tennessee, you must have a CDL Doubles/Triples endorsement to operate a commercial vehicle that has a double or triple trailer. It is illegal to operate a vehicle with multiple trailers without this endorsement.

To obtain the Doubles/Triples endorsement, you must pass a written exam and a skills test that specifically cover the knowledge and skills required to safely operate vehicles with multiple trailers. These tests ensure that you have the necessary knowledge and skills to safely operate these types of vehicles on public roads.

Operating a commercial vehicle with multiple trailers without the proper endorsement can result in fines, penalties, and even suspension or revocation of your CDL. It is important to comply with all of Tennessee's CDL regulations and requirements to ensure safe and legal operation of commercial vehicles.
You can add the CDL Doubles/Triples endorsement to your existing CDL license in Tennessee. To add the endorsement, you will need to pass a written knowledge test and a skills test that specifically cover the knowledge and skills required to safely operate vehicles with multiple trailers.

To add the endorsement to your CDL license, you will need to visit a Tennessee Department of Safety and Homeland Security (TDOSHS) Driver Services Center, complete an application for a CDL Doubles/Triples endorsement, and pay the required fee. You will then need to pass the written knowledge test and skills test to obtain the endorsement.

It is important to note that you must have a valid Tennessee CDL license before you can add any endorsements. If your CDL license is expired or suspended, you will need to renew or reinstate it before adding any endorsements.

Once you have added the CDL Doubles/Triples endorsement to your CDL license, it will be valid for as long as your CDL license is valid. You may need to renew the endorsement separately from your CDL license depending on the expiration date of your endorsement.
Yes, there are restrictions and limitations for drivers with a CDL Doubles/Triples endorsement in Tennessee. These restrictions are in place to ensure the safe operation of commercial vehicles with multiple trailers on public roads.

One restriction is that drivers with a Doubles/Triples endorsement may only operate vehicles with double or triple trailers. They are not authorized to operate any other type of commercial vehicle that requires a different endorsement or certification.

In addition, drivers with a Doubles/Triples endorsement are required to follow specific weight limits and length limits for their vehicles. They must also follow specific rules and regulations for turning, merging, and passing.

Furthermore, drivers with a Doubles/Triples endorsement must have specific safety equipment and devices on their vehicle, such as underride protection, reflective tape, and proper lighting.

It is important for drivers with a Doubles/Triples endorsement to understand and follow these restrictions and limitations to ensure safe operation of their vehicles on public roads. Failure to comply with these restrictions could result in fines, penalties, or even suspension or revocation of their CDL license.
In Tennessee, drivers with a CDL Doubles/Triples endorsement are subject to weight and length limits when operating vehicles with double or triple trailers. The weight and length limits depend on several factors, including the type of vehicle, the number of axles, and the type of cargo being transported.

Here are some of the weight and length limits for double/triple trailers in Tennessee:

- Maximum weight limit for a double trailer: 34,000 pounds
- Maximum weight limit for a triple trailer: 42,000 pounds
- Maximum length limit for a double trailer: 28 feet per trailer
- Maximum length limit for a triple trailer: 28 feet per trailer
- Maximum overall length limit for a combination of vehicles with a double or triple trailer: 65 feet

It is important to note that these weight and length limits are subject to change based on federal regulations or state laws. Drivers with a CDL Doubles/Triples endorsement should always check the most current regulations and laws to ensure they are in compliance when operating their vehicles.
Yes, there are specific safety considerations and regulations that drivers with a CDL Doubles/Triples endorsement must follow when driving double/triple trailers in Tennessee. These regulations are in place to ensure the safe operation of commercial vehicles and to reduce the risk of accidents.

Here are some of the safety considerations and regulations for driving double/triple trailers with a CDL Doubles/Triples endorsement:

1. Turning: Drivers must be aware of the length and weight of their vehicle when turning. They should always make wide turns, use their turn signals, and avoid sharp turns.

2. Merging: Drivers should use caution when merging onto highways or changing lanes. They should give themselves plenty of space and time to maneuver their vehicle safely.

3. Passing: Drivers should avoid passing other vehicles unless it is absolutely necessary. When passing, they must ensure they have enough space to pass safely and avoid cutting off other drivers.

4. Braking: Drivers with double/triple trailers must allow for additional stopping distance due to the increased weight and length of their vehicle. They should avoid sudden braking and give themselves plenty of space to stop.

5. Safety equipment: Drivers must ensure that their vehicle is equipped with proper safety equipment, including underride protection, reflective tape, and proper lighting.

6. Vehicle maintenance: Drivers must perform regular maintenance on their vehicle to ensure it is in good working condition. This includes checking brakes, tires, lights, and other components regularly.

It is important for drivers with a CDL Doubles/Triples endorsement to follow these safety considerations and regulations at all times when operating their vehicles. Failure to do so could result in fines, penalties, or even suspension or revocation of their CDL license.