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 two, three or four possible answer choices. Test questions come from the Nebraska 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.
1. What is another name for the service line?
The trailer service air line may also be referred to as the control line or signal line.
2. When coupling a trailer:
When coupling, make sure you couple matching glad hands. They are often color-coded to help drivers avoid mistakes. Typically, blue is used for service lines and red is used for emergency lines.
3. Before driving a vehicle with a dual air brake system, you must wait for the air compressor to build a minimum of ____ in both the primary and secondary systems.
Before driving a vehicle with a dual air brake system, you should wait for the air compressor to build up at least 100 psi in both the primary and secondary systems.
4. When you need to stop in an emergency, you should:
If you need to make an emergency stop, you can use either the controlled braking method or the stab braking method. It's important to brake in a way that keeps your vehicle traveling in a straight line while still allowing you to turn, if necessary.
5. A broken exhaust system:
A broken exhaust system can let poisonous fumes into a vehicle's cab or sleeper berth. Be sure to inspect your exhaust system for any loose, broken, or missing parts.
6. What is the average driver’s reaction time?
The average driver has a reaction time between three-quarters of a second and one second. At 55 mph, this corresponds to a distance of 61 feet traveled.
7. Backing with a trailer is dangerous because:
Backing is always dangerous because it is impossible to see everything that is behind your vehicle. Only drive in reverse if it is absolutely necessary.
Frequently Asked Questions
1. Obtain a Nebraska Commercial Driver's License (CDL): Before you can obtain a Doubles/Triples endorsement, you must first have a valid Nebraska CDL.
2. Meet the eligibility requirements: To be eligible for a Doubles/Triples endorsement, you must be at least 18 years old, hold a valid Nebraska CDL, and pass a written test.
3. Study for the CDL Doubles/Triples endorsement test: You can obtain study materials from your local driver's license office or online. It is important to study the materials thoroughly to ensure you are fully prepared for the written test.
4. Schedule and take the written test: Once you feel confident in your knowledge of Doubles/Triples rules and regulations, schedule an appointment to take the written test at your local driver's license office.
5. Pay the endorsement fee: After passing the written test, you will need to pay the endorsement fee to add it to your CDL. The fee varies depending on if it is a new endorsement or if it is being added to an existing CDL.
6. Practice driving with Doubles/Triples: Once you have obtained your Doubles/Triples endorsement, it is important to practice driving with these vehicles in order to become familiar with their handling and safety requirements.
7. Renewing the endorsement: Your Doubles/Triples endorsement will need to be renewed every five years. You will need to pass the written test again and pay the renewal fee.
It is important to note that there may be additional requirements or steps depending on your specific situation and circumstances. For more information, visit your local driver's license office or check the Nebraska Department of Motor Vehicles website.
1. Hold a valid Nebraska Commercial Driver’s License (CDL): You must have a valid Nebraska CDL to apply for a Doubles/Triples endorsement.
2. Age requirement: You must be at least 18 years of age to drive within the state of Nebraska and 21 years of age for interstate driving.
3. Pass the written test: You must pass a written test on Doubles/Triples rules and regulations. The test will cover topics such as coupling and uncoupling, inspecting doubles/triples, and driving doubles/triples.
4. No disqualifying criminal offenses: You must not have any disqualifying criminal offenses that would prevent you from obtaining a CDL.
5. Medical certification: You must provide a valid medical certification that meets the requirements for commercial driving. This can be obtained from a licensed medical examiner.
It is important to note that additional requirements may apply depending on your specific situation and circumstances. For more information, visit your local driver's license office or check the Nebraska Department of Motor Vehicles website.
It is important to note that operating Doubles/Triples requires additional skills and knowledge compared to driving a single commercial vehicle. Therefore, it is recommended that you undergo specialized training to learn how to properly couple, uncouple, and maneuver Doubles/Triples safely.
Additionally, some employers may require that drivers have experience or specialized training before operating Doubles/Triples. It is always a good idea to research the requirements of potential employers before pursuing a Doubles/Triples endorsement.
1. Inspecting Doubles/Triples: This section will test your knowledge of how to inspect Doubles/Triples for safety, including checking the coupling devices, electrical connections, and other components.
2. Coupling and uncoupling: This section will test your ability to properly couple and uncouple Doubles/Triples safely.
3. Driving Doubles/Triples: This section will test your knowledge of how to safely operate Doubles/Triples on the road, including turning, backing up, and changing lanes.
It is important that you study and prepare for this additional written test before attempting to obtain a CDL Doubles/Triples endorsement. You can find study materials and practice tests on the Nebraska Department of Motor Vehicles website or by visiting your local driver's license office.
1. Vehicle inspection: You will need to demonstrate your ability to inspect the Doubles/Triples vehicle and ensure that it is safe for the road.
2. Basic control skills: You will need to show your ability to control the Doubles/Triples vehicle through a series of maneuvers, including straight-line backing, offset backing, and alley docking.
3. On-road test: You will need to demonstrate your ability to safely operate the Doubles/Triples vehicle on public roads in different traffic situations.
During the skills test, you will need to perform specific maneuvers that are required for operating Doubles/Triples safely. For example, when demonstrating basic control skills, you may be required to couple and uncouple the trailers, back up in a straight line or at an angle, and successfully navigate around obstacles or barriers. During the on-road test, you may be required to make left and right turns safely and smoothly, merge onto highways or freeways, change lanes correctly and safely, and drive in different traffic situations.
It is important that you practice these maneuvers and skills with a qualified instructor before taking the CDL Doubles/Triples endorsement test.
Operating double/triple trailers without a CDL Doubles/Triples endorsement can result in serious consequences. You may face fines or penalties, and your employer may also face legal consequences. Additionally, in the event of an accident or safety violation, you may be held liable for any damages or injuries that occur.
Therefore, it is important that you obtain the necessary endorsement and follow all rules and regulations related to operating double/triple trailers in Nebraska.
1. Pass the Doubles/Triples written test: You will need to take and pass the written test specific to the Doubles/Triples endorsement.
2. Pass the Doubles/Triples skills test: You will need to take and pass the skills test specific to the Doubles/Triples endorsement.
3. Pay any required fees: There may be additional fees associated with adding the endorsement to your CDL license.
Once you have passed both tests and paid any required fees, you can have the endorsement added to your CDL license. It is important to note that you must already have a valid CDL license before you can add any endorsements.
You can contact your local DMV office or visit their website to obtain more information on adding a CDL Doubles/Triples endorsement to your existing CDL license in Nebraska.
Firstly, drivers with a CDL Doubles/Triples endorsement are only authorized to operate double/triple trailers that are within the weight limits specified by Nebraska law.
Secondly, drivers with a CDL Doubles/Triples endorsement are not authorized to operate triple trailers on any interstate highways in Nebraska.
Thirdly, drivers with a CDL Doubles/Triples endorsement are required to have the endorsement documentation in their possession while operating double/triple trailers.
It is important to note that violating any of these restrictions or limitations can lead to serious consequences, including fines or penalties, suspension or revocation of your CDL license, and even criminal charges. Therefore, it is important for drivers with a CDL Doubles/Triples endorsement to fully understand and comply with all applicable rules and regulations in Nebraska.
1. Maximum weight limits:
- The combined weight of the double/triple trailers cannot exceed 80,000 pounds.
- The weight of each individual trailer cannot exceed 28,000 pounds.
2. Maximum length limits:
- The maximum length for a double trailer is 28 feet for each trailer.
- The maximum length for a triple trailer is 28 feet for each trailer.
It is important to note that these maximum weight and length limits are subject to change, and drivers should always follow the most current Nebraska laws and regulations regarding double/triple trailers. Additionally, drivers should always ensure that their vehicles are properly maintained and loaded within the legal weight and length limits to ensure safe operation on the roads.
1. Proper Training: Drivers with a CDL Doubles/Triples endorsement must have proper training and experience to operate double/triple trailers safely.
2. Speed Limit: The maximum speed limit for vehicles with double/triple trailers is 65 mph on divided highways and expressways.
3. Lane Restrictions: In Nebraska, double/triple trailers are prohibited from using the far left lane of a highway with three or more lanes going in the same direction, except when passing or turning left.
4. Turning Radius: Double/triple trailers require more space to turn and maneuver than single trailers. Drivers must be aware of the turning radius of their vehicle and take necessary precautions when navigating turns.
5. Braking Distance: Double/triple trailers require more distance to stop than single trailers, especially when traveling at high speeds or carrying heavy loads. Drivers should maintain a safe following distance to allow for ample braking distance.
6. Load Securement: It is critical to ensure that the cargo is properly secured and balanced in double/triple trailers to prevent shifting, which can cause loss of vehicle control and accidents.
7. Inspection Requirements: Drivers must complete pre-trip inspections and ensure that their vehicle is in good working condition before operating double/triple trailers on the roads.
It is important for drivers with a CDL Doubles/Triples endorsement to be familiar with these safety considerations and regulations, as well as any other applicable laws or regulations in Nebraska. By following these rules, drivers can help ensure their own safety as well as the safety of others on the road.