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 possible answer choices. Test questions come from the Missouri Commercial Driver’s 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
8. Before a trip, you should make a visual check of a coupling to ensure that:
Explanation
When performing a visual check of coupling devices, you should make sure there is no space between the upper and lower fifth wheel. Ensure that the locking jaws are securely closed around the kingpin.
9. When parking, you should not use the parking brake if:
Explanation
If your brakes are hot after coming down a steep grade, you should not use your parking brake when parking. Let your brakes cool before applying the parking brake or risk damaging the brakes.
10. What do air brakes use to make the brakes work?
Explanation
Many large CMVs are equipped with air brakes. An air braking system uses compressed air to operate.
11. When using a fire extinguisher on a fire, you should:
Explanation
When using a fire extinguisher, you should stand as far away from the fire as possible. Aim the extinguisher at the base of the fire, not at the flames. If you are not sure which kind of extinguisher should be used on a fire, particularly a hazardous materials fire, you should wait for the firefighters to arrive and allow them to extinguish it.
12. The air compressor is connected to the:
Explanation
The air compressor of an air brake system is connected to the engine through gears or a v-belt. The compressor may be air-cooled or cooled by the engine cooling system.
13. What kind of brakes do most newer heavy-duty trucks use?
Explanation
Most newer heavy-duty vehicles use dual air brake systems. A dual air brake system has two separate air brake systems which use a single set of brake controls.
14. A pre-trip inspection should include:
Explanation
When examining the engine compartment during a pre-trip inspection, you should check the engine oil level, the radiator coolant level, and the condition of the hoses.
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Frequently Asked Questions
To obtain a CDL Doubles/Triples endorsement in Missouri, follow these steps:
1. Obtain a Missouri CDL: You must have a valid Missouri CDL before you can add any endorsements.
2. Study the Missouri CDL Manual: The manual includes information on safe driving practices, vehicle inspection, and other important information. You can obtain a copy of the manual online or at any Missouri State Highway Patrol Driver Examination Station.
3. Schedule an appointment for testing: Contact your local Missouri State Highway Patrol Driver Examination Station to schedule an appointment for testing.
4. Pass the written exam: There is a written test that covers information specific to driving with double or triple trailers. You must pass this test in order to obtain your endorsement.
5. Pass the skills test: The skills test includes a pre-trip inspection and a driving test with double or triple trailers. You must pass this test to obtain your endorsement.
6. Pay the fee: There is a fee for adding an endorsement to your CDL. Be sure to check with your local Missouri State Highway Patrol Driver Examination Station for current fees.
7. Receive your endorsement: Once you have passed both the written and skills tests, you will receive your Doubles/Triples endorsement on your CDL.
1. Obtain a Missouri CDL: You must have a valid Missouri CDL before you can add any endorsements.
2. Study the Missouri CDL Manual: The manual includes information on safe driving practices, vehicle inspection, and other important information. You can obtain a copy of the manual online or at any Missouri State Highway Patrol Driver Examination Station.
3. Schedule an appointment for testing: Contact your local Missouri State Highway Patrol Driver Examination Station to schedule an appointment for testing.
4. Pass the written exam: There is a written test that covers information specific to driving with double or triple trailers. You must pass this test in order to obtain your endorsement.
5. Pass the skills test: The skills test includes a pre-trip inspection and a driving test with double or triple trailers. You must pass this test to obtain your endorsement.
6. Pay the fee: There is a fee for adding an endorsement to your CDL. Be sure to check with your local Missouri State Highway Patrol Driver Examination Station for current fees.
7. Receive your endorsement: Once you have passed both the written and skills tests, you will receive your Doubles/Triples endorsement on your CDL.
To obtain a CDL Doubles/Triples license in Missouri, you must meet the following requirements:
1. Hold a valid Missouri CDL: You must already have a valid Missouri Commercial Driver's License (CDL) before you can apply for a Doubles/Triples endorsement.
2. Meet minimum age requirements: You must be at least 21 years old to drive commercial vehicles across state lines, and at least 18 years old to drive commercial vehicles within the state of Missouri.
3. Have a clean driving record: You cannot have any major traffic violations or convictions for driving under the influence (DUI) within the past three years.
4. Pass a medical exam: You must pass a Department of Transportation (DOT) medical examination to obtain a CDL Doubles/Triples license.
5. Pass a written test: You must pass a written test covering knowledge specific to driving with double or triple trailers.
6. Pass a skills test: You must pass a skills test that includes a pre-trip inspection and driving test with double or triple trailers.
7. Pay the fee: There is a fee for adding the Doubles/Triples endorsement to your CDL.
It's important to note that additional requirements may apply based on your specific situation, such as your employer's policies or the type of cargo you will be transporting.
1. Hold a valid Missouri CDL: You must already have a valid Missouri Commercial Driver's License (CDL) before you can apply for a Doubles/Triples endorsement.
2. Meet minimum age requirements: You must be at least 21 years old to drive commercial vehicles across state lines, and at least 18 years old to drive commercial vehicles within the state of Missouri.
3. Have a clean driving record: You cannot have any major traffic violations or convictions for driving under the influence (DUI) within the past three years.
4. Pass a medical exam: You must pass a Department of Transportation (DOT) medical examination to obtain a CDL Doubles/Triples license.
5. Pass a written test: You must pass a written test covering knowledge specific to driving with double or triple trailers.
6. Pass a skills test: You must pass a skills test that includes a pre-trip inspection and driving test with double or triple trailers.
7. Pay the fee: There is a fee for adding the Doubles/Triples endorsement to your CDL.
It's important to note that additional requirements may apply based on your specific situation, such as your employer's policies or the type of cargo you will be transporting.
Missouri does not have specific requirements for experience or training to obtain a CDL Doubles/Triples endorsement. However, it's highly recommended to receive training and practice driving with double or triple trailers before attempting the skills test.
You may consider enrolling in a commercial driving school or a training program that focuses on driving with double or triple trailers. These programs can provide you with the necessary knowledge and skills to pass the written and skills tests, as well as prepare you for the challenges of driving with multiple trailers.
Keep in mind that some employers may require additional training or experience before hiring you to drive with double or triple trailers. It's important to check with potential employers about their specific requirements before pursuing a Doubles/Triples endorsement.
You may consider enrolling in a commercial driving school or a training program that focuses on driving with double or triple trailers. These programs can provide you with the necessary knowledge and skills to pass the written and skills tests, as well as prepare you for the challenges of driving with multiple trailers.
Keep in mind that some employers may require additional training or experience before hiring you to drive with double or triple trailers. It's important to check with potential employers about their specific requirements before pursuing a Doubles/Triples endorsement.
Yes, there is an additional written test that you must pass to obtain a CDL Doubles/Triples endorsement in Missouri. The written test covers knowledge specific to driving with double or triple trailers, such as coupling and uncoupling procedures, inspecting and checking the air brakes, and handling multiple trailers.
The written test for the Doubles/Triples endorsement is a separate exam from the general knowledge test that is required for all CDL applicants. You must pass both exams to be eligible for a CDL with a Doubles/Triples endorsement.
Additionally, you may be required to take additional written tests or exams depending on the type of cargo you plan to transport. For example, if you plan to transport hazardous materials, you must pass a written test on hazardous materials regulations and obtain a Hazmat endorsement on your CDL.
The written test for the Doubles/Triples endorsement is a separate exam from the general knowledge test that is required for all CDL applicants. You must pass both exams to be eligible for a CDL with a Doubles/Triples endorsement.
Additionally, you may be required to take additional written tests or exams depending on the type of cargo you plan to transport. For example, if you plan to transport hazardous materials, you must pass a written test on hazardous materials regulations and obtain a Hazmat endorsement on your CDL.
To obtain a CDL Doubles/Triples endorsement in Missouri, you must pass a skills test that includes specific maneuvers and procedures related to driving with double or triple trailers. The skills test consists of three parts: the pre-trip inspection, basic control skills, and on-road driving.
During the basic control skills portion of the test, you will be required to demonstrate your ability to control your vehicle while performing specific maneuvers. The maneuvers may include straight-line backing, offset backing, and parallel parking with double or triple trailers.
During the on-road driving portion of the test, you will be evaluated on your ability to safely and efficiently handle your vehicle in traffic. You will be required to demonstrate your ability to signal and change lanes properly while driving with double or triple trailers.
Additionally, you must be able to handle emergency situations such as brake failure or a tire blowout. You will also be evaluated on your ability to follow traffic laws and safely interact with other drivers on the road.
It's important to note that the specific maneuvers and procedures required for the Doubles/Triples endorsement skills test may vary depending on the testing location in Missouri. It's recommended to check with your local testing facility for specific requirements and guidelines.
During the basic control skills portion of the test, you will be required to demonstrate your ability to control your vehicle while performing specific maneuvers. The maneuvers may include straight-line backing, offset backing, and parallel parking with double or triple trailers.
During the on-road driving portion of the test, you will be evaluated on your ability to safely and efficiently handle your vehicle in traffic. You will be required to demonstrate your ability to signal and change lanes properly while driving with double or triple trailers.
Additionally, you must be able to handle emergency situations such as brake failure or a tire blowout. You will also be evaluated on your ability to follow traffic laws and safely interact with other drivers on the road.
It's important to note that the specific maneuvers and procedures required for the Doubles/Triples endorsement skills test may vary depending on the testing location in Missouri. It's recommended to check with your local testing facility for specific requirements and guidelines.
No, you cannot legally operate double or triple trailers without a CDL Doubles/Triples endorsement in Missouri. A CDL with a Doubles/Triples endorsement is required for anyone who wants to operate a commercial motor vehicle that has more than one trailer attached to it.
In Missouri, any vehicle combination with a gross combination weight rating (GCWR) of 26,001 pounds or more requires a CDL. If you plan to operate a commercial motor vehicle with double or triple trailers, you must obtain a CDL with the Doubles/Triples endorsement, in addition to any other necessary endorsements for your specific type of cargo.
Driving without the proper endorsements on your CDL can result in fines, license suspension or revocation, and even legal consequences in some cases. It's important to follow all state and federal regulations related to commercial driving to ensure safety on the road and avoid any legal issues.
In Missouri, any vehicle combination with a gross combination weight rating (GCWR) of 26,001 pounds or more requires a CDL. If you plan to operate a commercial motor vehicle with double or triple trailers, you must obtain a CDL with the Doubles/Triples endorsement, in addition to any other necessary endorsements for your specific type of cargo.
Driving without the proper endorsements on your CDL can result in fines, license suspension or revocation, and even legal consequences in some cases. It's important to follow all state and federal regulations related to commercial driving to ensure safety on the road and avoid any legal issues.
To add the CDL Doubles/Triples endorsement to your existing CDL license in Missouri, you will need to pass the required knowledge and skills tests and pay the endorsement fee. You can do this by visiting your local Missouri Department of Revenue Driver License Office, where you can apply for the endorsement and schedule your skills test.
You will need to provide documentation of your identity, residency, and legal status in the United States. You will also need to provide proof of your current CDL license, medical certification, and any other necessary endorsements or restrictions.
Once you have passed the required tests and paid the fee, your Missouri CDL license will be updated to reflect the Doubles/Triples endorsement. You do not need to apply for a new license unless you need to make other changes or updates to your commercial driving status.
You will need to provide documentation of your identity, residency, and legal status in the United States. You will also need to provide proof of your current CDL license, medical certification, and any other necessary endorsements or restrictions.
Once you have passed the required tests and paid the fee, your Missouri CDL license will be updated to reflect the Doubles/Triples endorsement. You do not need to apply for a new license unless you need to make other changes or updates to your commercial driving status.
Yes, there are restrictions and limitations for drivers with a CDL Doubles/Triples endorsement in Missouri.
Drivers with a Doubles/Triples endorsement are authorized to operate commercial motor vehicles with two or three trailers attached, but there are specific weight limits and other restrictions that must be followed. These include:
1. Gross Vehicle Weight Rating (GVWR) limit: The maximum GVWR for a vehicle combination with two or three trailers is 80,000 pounds.
2. Trailer length limit: The maximum length of each trailer is 28 feet.
3. Maximum number of trailers: A driver with a Doubles/Triples endorsement is allowed to tow two or three trailers, but no more than that.
4. Special driving skills required: Towing double or triple trailers requires special driving skills and techniques. Drivers must be able to safely maneuver and control the vehicle combination in different driving conditions, such as turning, backing up, and braking.
It's important for drivers with a CDL Doubles/Triples endorsement to be aware of these restrictions and limitations and follow them at all times to ensure safety on the road. Violating any of these restrictions can result in fines, license suspension or revocation, and other legal consequences.
Drivers with a Doubles/Triples endorsement are authorized to operate commercial motor vehicles with two or three trailers attached, but there are specific weight limits and other restrictions that must be followed. These include:
1. Gross Vehicle Weight Rating (GVWR) limit: The maximum GVWR for a vehicle combination with two or three trailers is 80,000 pounds.
2. Trailer length limit: The maximum length of each trailer is 28 feet.
3. Maximum number of trailers: A driver with a Doubles/Triples endorsement is allowed to tow two or three trailers, but no more than that.
4. Special driving skills required: Towing double or triple trailers requires special driving skills and techniques. Drivers must be able to safely maneuver and control the vehicle combination in different driving conditions, such as turning, backing up, and braking.
It's important for drivers with a CDL Doubles/Triples endorsement to be aware of these restrictions and limitations and follow them at all times to ensure safety on the road. Violating any of these restrictions can result in fines, license suspension or revocation, and other legal consequences.
In Missouri, drivers with a CDL Doubles/Triples endorsement are authorized to operate commercial motor vehicles with two or three trailers attached, subject to certain weight and length limits. The maximum weight and length limits for double/triple trailers with a CDL Doubles/Triples endorsement are:
1. Gross Vehicle Weight Rating (GVWR) limit: The maximum GVWR for a vehicle combination with two or three trailers is 80,000 pounds.
2. Trailer length limit: The maximum length of each trailer is 28 feet.
It's important for drivers with a CDL Doubles/Triples endorsement to be aware of these weight and length limits and follow them at all times to ensure safety on the road. Violating any of these restrictions can result in fines, license suspension or revocation, and other legal consequences.
1. Gross Vehicle Weight Rating (GVWR) limit: The maximum GVWR for a vehicle combination with two or three trailers is 80,000 pounds.
2. Trailer length limit: The maximum length of each trailer is 28 feet.
It's important for drivers with a CDL Doubles/Triples endorsement to be aware of these weight and length limits and follow them at all times to ensure safety on the road. Violating any of these restrictions can result in fines, license suspension or revocation, and other legal consequences.
Yes, there are specific safety considerations and regulations for driving double/triple trailers with a CDL Doubles/Triples endorsement in Missouri. Here are some important regulations and safety considerations:
1. Special driving skills required: Towing double or triple trailers requires special driving skills and techniques. Drivers must be able to safely maneuver and control the vehicle combination in different driving conditions, such as turning, backing up, and braking.
2. Safety equipment requirements: Drivers must ensure that all equipment, including brakes, lights, and tires, on the vehicle combination is in good working condition before driving on public roads.
3. Regular inspections: Drivers must perform regular safety inspections of the vehicle combination before each trip to ensure that it is safe to operate on public roads.
4. Maximum speed limits: The maximum speed limit for a vehicle combination with two or three trailers is 65 mph on rural interstates and 60 mph on other highways.
5. Following distance: Drivers must maintain a greater following distance than when driving a single vehicle to allow for safe stopping distances.
6. Height restrictions: Drivers must be aware of height restrictions when driving a double/triple trailer combination, as some overpasses and bridges may not have enough clearance for the height of the trailers.
7. Weight distribution: Drivers must ensure that the weight of cargo is evenly distributed across all trailers to prevent overloading of individual trailers.
It's important for drivers with a CDL Doubles/Triples endorsement to be aware of these regulations and safety considerations and follow them at all times to ensure safety on the road.
1. Special driving skills required: Towing double or triple trailers requires special driving skills and techniques. Drivers must be able to safely maneuver and control the vehicle combination in different driving conditions, such as turning, backing up, and braking.
2. Safety equipment requirements: Drivers must ensure that all equipment, including brakes, lights, and tires, on the vehicle combination is in good working condition before driving on public roads.
3. Regular inspections: Drivers must perform regular safety inspections of the vehicle combination before each trip to ensure that it is safe to operate on public roads.
4. Maximum speed limits: The maximum speed limit for a vehicle combination with two or three trailers is 65 mph on rural interstates and 60 mph on other highways.
5. Following distance: Drivers must maintain a greater following distance than when driving a single vehicle to allow for safe stopping distances.
6. Height restrictions: Drivers must be aware of height restrictions when driving a double/triple trailer combination, as some overpasses and bridges may not have enough clearance for the height of the trailers.
7. Weight distribution: Drivers must ensure that the weight of cargo is evenly distributed across all trailers to prevent overloading of individual trailers.
It's important for drivers with a CDL Doubles/Triples endorsement to be aware of these regulations and safety considerations and follow them at all times to ensure safety on the road.
