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. Each question has four answer choices. To pass, the applicant must answer at least 16 questions correctly. Test questions come from the Texas Commercial Motor Vehicle Drivers Handbook. 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 color is the low air pressure warning light?
Explanation
A low air pressure warning signal is required in vehicles with air brakes. The warning light is usually red and may be accompanied by a buzzer.
9. Large combination vehicles take the longest amount of time to stop:
Explanation
Large combination vehicles take longer to stop when they are empty than when they are loaded. The decreased weight causes a vehicle's wheels to have decreased traction on the surface of the road.
10. After finishing a pre-trip inspection, you should:
Explanation
Before a trip, you should ensure that air reaches all air brakes on all trailers by opening up the rear emergency line and service line shut-off valves to listen for escaping air. Close both shut-off valves before beginning to drive.
11. When checking the engine compartment:
Explanation
Before inspecting the engine compartment, make sure that the parking brakes are on and/or the wheels are chocked. Check the engine compartment before entering the cab and starting the engine.
12. A tractor protection valve is:
Explanation
On combination vehicles with air brakes, the tractor protection valve keeps air in the tractor or truck brake system, should the trailer develop a bad leak or break away from the tractor.
13. Due to the "crack-the-whip" effect:
Explanation
Double and triple trailer combinations are more likely to turn over due to the "crack-the-whip" effect than are other combination vehicles. Drivers should be aware of the rearward amplification of their specific vehicles and steer accordingly.
14. When driving a double, the lightest trailer should be placed:
Explanation
For safest handling when driving a double or triple combination vehicle, the most heavily loaded semi-trailer should be placed in the first position behind the tractor. The lightest trailer should be placed in the rear position.
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Frequently Asked Questions
To obtain a CDL Doubles/Triples endorsement in Texas, you must follow these steps:
1. Obtain a Texas Commercial Driver License (CDL) by passing the written knowledge test and skills test for the class of vehicle you intend to drive.
2. Study the Texas CDL Handbook to prepare for the Doubles/Triples endorsement exam.
3. Schedule an appointment at a Texas Department of Public Safety (DPS) Driver License Office.
4. Pass the written knowledge test for the Doubles/Triples endorsement, which consists of 20 multiple-choice questions. To pass, you must answer at least 16 questions correctly.
5. Pay the fee for the Doubles/Triples endorsement, which is $10.
6. Take a skills test in a vehicle with doubles/triples to demonstrate your ability to handle these types of vehicles safely and effectively. The skills test must be taken in a vehicle with doubles/triples and must be conducted by a certified CDL examiner.
7. Once you have passed both the written and skills tests, your CDL will be updated to reflect your Doubles/Triples endorsement.
Note: You must already hold a Texas CDL before you can obtain a Doubles/Triples endorsement. Additionally, you must be at least 18 years old to drive doubles/triples within the state of Texas, and at least 21 years old to drive them across state lines or transport hazardous materials.
1. Obtain a Texas Commercial Driver License (CDL) by passing the written knowledge test and skills test for the class of vehicle you intend to drive.
2. Study the Texas CDL Handbook to prepare for the Doubles/Triples endorsement exam.
3. Schedule an appointment at a Texas Department of Public Safety (DPS) Driver License Office.
4. Pass the written knowledge test for the Doubles/Triples endorsement, which consists of 20 multiple-choice questions. To pass, you must answer at least 16 questions correctly.
5. Pay the fee for the Doubles/Triples endorsement, which is $10.
6. Take a skills test in a vehicle with doubles/triples to demonstrate your ability to handle these types of vehicles safely and effectively. The skills test must be taken in a vehicle with doubles/triples and must be conducted by a certified CDL examiner.
7. Once you have passed both the written and skills tests, your CDL will be updated to reflect your Doubles/Triples endorsement.
Note: You must already hold a Texas CDL before you can obtain a Doubles/Triples endorsement. Additionally, you must be at least 18 years old to drive doubles/triples within the state of Texas, and at least 21 years old to drive them across state lines or transport hazardous materials.
To get a CDL Doubles/Triples license in Texas, you must meet the following requirements:
1. Be at least 18 years old.
2. Hold a valid Texas commercial driver's license (CDL) of the appropriate class.
3. Pass the Doubles/Triples written knowledge test, which covers topics such as coupling and uncoupling, inspecting doubles/triples, and checking air brakes.
4. Pass a skills test in a vehicle with doubles/triples to demonstrate your ability to handle these types of vehicles safely and effectively. The skills test must be conducted by a certified CDL examiner.
5. Pay the $10 fee for the Doubles/Triples endorsement.
Note that if you are under 21 years old, you will be restricted to driving doubles/triples within the state of Texas only. You must be at least 21 years old to drive doubles/triples across state lines or transport hazardous materials. Additionally, you must meet all other requirements for obtaining a CDL in Texas, including passing a medical exam and meeting the state's driving record and criminal history standards.
1. Be at least 18 years old.
2. Hold a valid Texas commercial driver's license (CDL) of the appropriate class.
3. Pass the Doubles/Triples written knowledge test, which covers topics such as coupling and uncoupling, inspecting doubles/triples, and checking air brakes.
4. Pass a skills test in a vehicle with doubles/triples to demonstrate your ability to handle these types of vehicles safely and effectively. The skills test must be conducted by a certified CDL examiner.
5. Pay the $10 fee for the Doubles/Triples endorsement.
Note that if you are under 21 years old, you will be restricted to driving doubles/triples within the state of Texas only. You must be at least 21 years old to drive doubles/triples across state lines or transport hazardous materials. Additionally, you must meet all other requirements for obtaining a CDL in Texas, including passing a medical exam and meeting the state's driving record and criminal history standards.
Yes, you need specific experience and training to obtain a CDL Doubles/Triples endorsement in Texas.
First, you must hold a valid Texas commercial driver's license (CDL) of the appropriate class, which requires passing a written knowledge test and a skills test in a vehicle of that class.
Second, you must pass a written knowledge test specifically for the Doubles/Triples endorsement, which covers topics such as coupling and uncoupling, inspecting doubles/triples, and checking air brakes. This knowledge can be gained through formal training courses or self-study of the Texas CDL Handbook.
Third, you must pass a skills test in a vehicle with doubles/triples to demonstrate your ability to handle these types of vehicles safely and effectively. The skills test must be conducted by a certified CDL examiner.
It is strongly recommended that you complete a formal training program before attempting to obtain a CDL Doubles/Triples endorsement. This will give you the opportunity to gain hands-on experience with driving doubles/triples and receive instruction from experienced instructors who can help you prepare for the written and skills tests.
First, you must hold a valid Texas commercial driver's license (CDL) of the appropriate class, which requires passing a written knowledge test and a skills test in a vehicle of that class.
Second, you must pass a written knowledge test specifically for the Doubles/Triples endorsement, which covers topics such as coupling and uncoupling, inspecting doubles/triples, and checking air brakes. This knowledge can be gained through formal training courses or self-study of the Texas CDL Handbook.
Third, you must pass a skills test in a vehicle with doubles/triples to demonstrate your ability to handle these types of vehicles safely and effectively. The skills test must be conducted by a certified CDL examiner.
It is strongly recommended that you complete a formal training program before attempting to obtain a CDL Doubles/Triples endorsement. This will give you the opportunity to gain hands-on experience with driving doubles/triples and receive instruction from experienced instructors who can help you prepare for the written and skills tests.
Yes, you are required to pass an additional written test to obtain a CDL Doubles/Triples endorsement in Texas. You must first pass the general knowledge test and obtain a commercial learner's permit (CLP) before taking the Doubles/Triples endorsement test.
The Doubles/Triples endorsement test will include questions related to the safe operation of double and triple trailers, including coupling and uncoupling procedures, inspecting doubles/triples, and checking air brakes. You will need to study the Texas Commercial Motor Vehicle Drivers Handbook, which includes information specific to driving double and triple trailers.
In addition to the endorsement test, you will also need to pass a skills test in a vehicle with doubles/triples. The skills test will include a pre-trip inspection, basic control skills (such as backing up and turning), and an on-road driving test.
Overall, obtaining a CDL Doubles/Triples endorsement requires passing both a written knowledge test and a skills test specific to driving double or triple trailers.
The Doubles/Triples endorsement test will include questions related to the safe operation of double and triple trailers, including coupling and uncoupling procedures, inspecting doubles/triples, and checking air brakes. You will need to study the Texas Commercial Motor Vehicle Drivers Handbook, which includes information specific to driving double and triple trailers.
In addition to the endorsement test, you will also need to pass a skills test in a vehicle with doubles/triples. The skills test will include a pre-trip inspection, basic control skills (such as backing up and turning), and an on-road driving test.
Overall, obtaining a CDL Doubles/Triples endorsement requires passing both a written knowledge test and a skills test specific to driving double or triple trailers.
To obtain a CDL Doubles/Triples endorsement in Texas, you will be required to pass a skills test that includes specific maneuvers related to driving double or triple trailers. The skills test will be conducted in a vehicle with double or triple trailers and will include the following maneuvers:
1. Pre-trip inspection: You will need to demonstrate your ability to inspect the double or triple trailers for safety before beginning your trip. This includes checking the coupling system, brakes, tires, lights, and other components.
2. Coupling and uncoupling: You will need to demonstrate your ability to safely couple and uncouple the double or triple trailers.
3. Straight-line backing: You will need to back up the double or triple trailers in a straight line for a specified distance.
4. Offset backing: You will need to back up the double or triple trailers through a specified lane in an offset pattern.
5. Parallel parking: You will need to park the double or triple trailers in a parallel parking space.
6. On-road driving: You will need to demonstrate your ability to safely operate the double or triple trailers on public roads, including changing lanes, turning, stopping, and accelerating.
During each of these maneuvers, you will be evaluated on your ability to safely operate the vehicle and avoid accidents or damage. It is important to practice these maneuvers extensively before attempting the skills test so that you feel confident in your abilities.
1. Pre-trip inspection: You will need to demonstrate your ability to inspect the double or triple trailers for safety before beginning your trip. This includes checking the coupling system, brakes, tires, lights, and other components.
2. Coupling and uncoupling: You will need to demonstrate your ability to safely couple and uncouple the double or triple trailers.
3. Straight-line backing: You will need to back up the double or triple trailers in a straight line for a specified distance.
4. Offset backing: You will need to back up the double or triple trailers through a specified lane in an offset pattern.
5. Parallel parking: You will need to park the double or triple trailers in a parallel parking space.
6. On-road driving: You will need to demonstrate your ability to safely operate the double or triple trailers on public roads, including changing lanes, turning, stopping, and accelerating.
During each of these maneuvers, you will be evaluated on your ability to safely operate the vehicle and avoid accidents or damage. It is important to practice these maneuvers extensively before attempting the skills test so that you feel confident in your abilities.
No, you cannot legally operate double or triple trailers without a CDL Doubles/Triples endorsement in Texas. Double and triple trailers require additional training and skills to operate safely, and the endorsement is required by law to ensure that drivers have the necessary knowledge and experience to operate these vehicles.
Driving a double or triple trailer without the proper endorsement can result in fines, penalties, and even the suspension or revocation of your commercial driver's license. It is important to obtain the necessary endorsements and follow all regulations and laws related to driving commercial vehicles to ensure your safety and the safety of others on the road.
Driving a double or triple trailer without the proper endorsement can result in fines, penalties, and even the suspension or revocation of your commercial driver's license. It is important to obtain the necessary endorsements and follow all regulations and laws related to driving commercial vehicles to ensure your safety and the safety of others on the road.
If you already hold a valid Texas CDL license, you can add the CDL Doubles/Triples endorsement to your license by passing the required knowledge and skills tests.
To add the endorsement to your existing CDL license, you will need to:
1. Study for the Doubles/Triples endorsement test and take and pass the written knowledge test at a Texas driver's license office.
2. Once you pass the written test, you will need to schedule and pass a skills test in a vehicle with double or triple trailers, demonstrating your ability to safely operate them.
3. Once you have passed both tests, your new CDL license will reflect the Doubles/Triples endorsement.
You do not need to apply for a new CDL license to add this endorsement. Adding an endorsement to your existing CDL license typically involves paying a fee and providing proof of passing the required tests.
To add the endorsement to your existing CDL license, you will need to:
1. Study for the Doubles/Triples endorsement test and take and pass the written knowledge test at a Texas driver's license office.
2. Once you pass the written test, you will need to schedule and pass a skills test in a vehicle with double or triple trailers, demonstrating your ability to safely operate them.
3. Once you have passed both tests, your new CDL license will reflect the Doubles/Triples endorsement.
You do not need to apply for a new CDL license to add this endorsement. Adding an endorsement to your existing CDL license typically involves paying a fee and providing proof of passing the required tests.
Yes, there are some restrictions and limitations for drivers with a CDL Doubles/Triples endorsement in Texas. These include:
1. Length and weight restrictions: Double or triple trailers are subject to certain length and weight restrictions, and drivers with a Doubles/Triples endorsement must comply with these restrictions.
2. Special driving skills required: Driving double or triple trailers requires special driving skills, and drivers must be able to operate these vehicles safely and maneuver them in tight spaces.
3. Limitations on certain roads: Some roads and highways may be off-limits for drivers of double or triple trailers, especially in urban areas where space is limited.
4. Additional training may be required: Employers may require additional training for drivers with a Doubles/Triples endorsement to ensure they can safely operate double or triple trailers.
It is important for drivers with a CDL Doubles/Triples endorsement to know and follow all regulations related to operating these vehicles safely and legally. Violating any of these restrictions can result in fines, penalties, and even the suspension or revocation of your commercial driver's license.
1. Length and weight restrictions: Double or triple trailers are subject to certain length and weight restrictions, and drivers with a Doubles/Triples endorsement must comply with these restrictions.
2. Special driving skills required: Driving double or triple trailers requires special driving skills, and drivers must be able to operate these vehicles safely and maneuver them in tight spaces.
3. Limitations on certain roads: Some roads and highways may be off-limits for drivers of double or triple trailers, especially in urban areas where space is limited.
4. Additional training may be required: Employers may require additional training for drivers with a Doubles/Triples endorsement to ensure they can safely operate double or triple trailers.
It is important for drivers with a CDL Doubles/Triples endorsement to know and follow all regulations related to operating these vehicles safely and legally. Violating any of these restrictions can result in fines, penalties, and even the suspension or revocation of your commercial driver's license.
In Texas, the maximum weight and length limits for double/triple trailers with a CDL Doubles/Triples endorsement are as follows:
1. Gross Vehicle Weight Rating (GVWR): The maximum GVWR for a combination of two or three vehicles (tractor-trailer-trailer) is 80,000 pounds.
2. Length: The maximum length of a combination of two or three vehicles (tractor-trailer-trailer) is 65 feet.
It is important to note that these weight and length limits are subject to change and may vary depending on the type of cargo being transported, the type of trailer being used, and other factors. Drivers with a CDL Doubles/Triples endorsement should be familiar with all weight and length restrictions and comply with them at all times to avoid fines, penalties, or other legal consequences.
1. Gross Vehicle Weight Rating (GVWR): The maximum GVWR for a combination of two or three vehicles (tractor-trailer-trailer) is 80,000 pounds.
2. Length: The maximum length of a combination of two or three vehicles (tractor-trailer-trailer) is 65 feet.
It is important to note that these weight and length limits are subject to change and may vary depending on the type of cargo being transported, the type of trailer being used, and other factors. Drivers with a CDL Doubles/Triples endorsement should be familiar with all weight and length restrictions and comply with them at all times to avoid fines, penalties, or other legal consequences.
Yes, there are several specific safety considerations and regulations for driving double/triple trailers with a CDL Doubles/Triples endorsement in Texas. These include:
1. Special driving skills: Drivers with a Doubles/Triples endorsement must have special driving skills, as driving double/triple trailers requires more skill and attention than driving a single vehicle.
2. Weight distribution: Proper weight distribution is critical for safe operation of double/triple trailers. Drivers should ensure that the weight is evenly distributed between the axles of each trailer to avoid instability and rollover incidents.
3. Braking: Double/triple trailers require more time to stop than single vehicles, so drivers should allow for extra braking distance and use the proper braking techniques to avoid jackknifing or other accidents.
4. Turning: Turning with double/triple trailers can be challenging due to their length, so drivers should take wider turns and use their mirrors to ensure that they do not hit any obstacles.
5. Lane changes: Drivers should be extra cautious when changing lanes with double/triple trailers, as these vehicles have large blind spots that can make it difficult to see other vehicles on the road.
6. Route planning: Drivers should plan their routes carefully to avoid roads or areas where double/triple trailers are not allowed or where there may be low bridges, narrow roads, or other obstacles that could make it difficult to maneuver.
It is critical for drivers with a CDL Doubles/Triples endorsement to follow all safety regulations and guidelines when operating these vehicles to ensure the safety of themselves and others on the road.
1. Special driving skills: Drivers with a Doubles/Triples endorsement must have special driving skills, as driving double/triple trailers requires more skill and attention than driving a single vehicle.
2. Weight distribution: Proper weight distribution is critical for safe operation of double/triple trailers. Drivers should ensure that the weight is evenly distributed between the axles of each trailer to avoid instability and rollover incidents.
3. Braking: Double/triple trailers require more time to stop than single vehicles, so drivers should allow for extra braking distance and use the proper braking techniques to avoid jackknifing or other accidents.
4. Turning: Turning with double/triple trailers can be challenging due to their length, so drivers should take wider turns and use their mirrors to ensure that they do not hit any obstacles.
5. Lane changes: Drivers should be extra cautious when changing lanes with double/triple trailers, as these vehicles have large blind spots that can make it difficult to see other vehicles on the road.
6. Route planning: Drivers should plan their routes carefully to avoid roads or areas where double/triple trailers are not allowed or where there may be low bridges, narrow roads, or other obstacles that could make it difficult to maneuver.
It is critical for drivers with a CDL Doubles/Triples endorsement to follow all safety regulations and guidelines when operating these vehicles to ensure the safety of themselves and others on the road.
