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. Test questions come from the Ohio Commercial Driver’s 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. A tread depth of ____ should be in every major groove of a front tire.
For safe operation, a commercial motor vehicle needs a tread depth of 4/32 of an inch in every major groove on the front tires, and a tread depth of 2/32 of an inch on other tires.
2. Why do large vehicles use air brakes?
If used and maintained properly, air brakes are a safe and effective way to stop large, heavy vehicles.
3. How can you check for a leak in hydraulic brakes?
Check hydraulic brakes by pumping the brake pedal three times before applying firm pressure to the pedal for five seconds. The pedal should not move. If it does, there may be a leak or some other problem in the braking system.
4. Texting while driving is especially dangerous because:
Texting while driving is particularly dangerous because it is both a mental and physical distraction to the driver. In addition to diverting a driver's mental attention away from the road, texting requires a person to remove at least one hand from the vehicle's controls.
5. While driving, a driver should:
It is essential that you are aware of what is happening on all sides of your vehicle at all times. Scan the road ahead and make regular checks of the mirrors on both sides of your vehicle while you are driving.
6. Vehicles with low underneath clearance may be difficult to drive:
Railroad-highway crossings may be difficult to cross when pulling a trailer with a low underneath clearance. In particular, both low-slung units and single-axle tractors pulling long trailers are especially challenging to drive over raised crossings.
7. Glad hands should be securely connected to:
When inspecting the convertor dolly, ensure that all components are present and in proper working condition. The air lines should be securely attached to the proper glad hands and should not contain any leaks. They should be attached with enough slack to allow easy turning.
Frequently Asked Questions
1. Obtain a valid Ohio commercial driver's license (CDL).
2. Complete the CDL Doubles/Triples endorsement application form, which can be found on the Ohio Bureau of Motor Vehicles (BMV) website.
3. Pass the Doubles/Triples knowledge test at an Ohio BMV testing location. You must score at least 80% to pass.
4. Schedule and pass the Doubles/Triples skills test with an Ohio BMV-approved third-party tester. The skills test will assess your ability to safely handle a vehicle with multiple trailers attached.
5. Pay the required fee for the endorsement.
Note: You must be at least 18 years old and hold a valid CDL to obtain a Doubles/Triples endorsement in Ohio. However, if you plan to drive across state lines or transport hazardous materials, you must be at least 21 years old.
1. Be at least 18 years old (21 years old for interstate and hazardous materials transport)
2. Hold a valid Ohio Class A CDL
3. Pass the Doubles/Triples endorsement knowledge test
4. Pass the Doubles/Triples endorsement skills test
5. Meet the medical requirements for a commercial driver's license
6. Have a clean driving record (no serious traffic violations or disqualifications in the past)
7. Provide proof of your legal presence in the United States
8. Pay the required fees.
Additionally, you must be knowledgeable about driving practices and safety regulations related to operating vehicles with multiple trailers, including coupling and uncoupling procedures, weight distribution, braking systems, and spacing requirements.
To prepare for the Doubles/Triples endorsement skills test, you may want to consider taking a training course or practicing with an experienced driver who already holds the endorsement. The skills test will assess your ability to safely handle a vehicle with multiple trailers attached, so it's important to be familiar with coupling and uncoupling procedures, weight distribution, braking systems, and spacing requirements.
You may also want to review the Ohio CDL Handbook and other study materials provided by the Ohio Bureau of Motor Vehicles to ensure that you are knowledgeable about driving practices and safety regulations related to operating vehicles with multiple trailers.
1. Coupling and uncoupling procedures
2. Weight distribution
3. Braking systems
4. Spacing requirements
5. Safety regulations for operating vehicles with multiple trailers
The knowledge test is generally a multiple-choice exam that you will need to take and pass before you can take the Doubles/Triples endorsement skills test.
In addition to the Doubles/Triples endorsement knowledge test, you will also need to pass any other required written tests for your CDL license class and any other endorsements you are seeking, such as the general knowledge test, air brakes test, and hazardous materials (HazMat) test.
1. Vehicle inspection: You will be required to perform a complete inspection of your vehicle, including checking the coupling system and ensuring that all trailers are properly secured.
2. Straight line backing: You will need to back up your vehicle in a straight line for a distance of at least 100 feet.
3. Offset backing: You will need to back up your vehicle into a space to the left or right of your starting position, while positioning it within a set of cones.
4. Alley docking: You will need to back up your vehicle into an alleyway while positioning it within a set of cones.
5. Coupling and uncoupling: You will need to demonstrate proper procedures for coupling and uncoupling your vehicle.
6. Road test: You will need to drive your vehicle on public roads while demonstrating safe driving practices, including accelerating, braking, turning, and changing lanes.
It is important to practice these maneuvers and ensure that you are comfortable operating a commercial vehicle with multiple trailers attached before taking the skills test. It is also recommended that you take a training course or practice with an experienced driver before attempting the test.
If you are caught operating a commercial vehicle with double or triple trailers without the proper endorsement, you may face fines, penalties, and even suspension or revocation of your CDL license. Additionally, your employer may also face penalties and fines for allowing you to operate a commercial vehicle without the proper endorsements.
It is important to obtain the proper endorsements for your CDL license and ensure that you are properly trained and qualified to operate a commercial vehicle with multiple trailers attached before attempting to do so.
You can schedule the written knowledge test and skills test through the Ohio Bureau of Motor Vehicles (BMV) or an approved third-party tester. You will need to provide your current CDL license, proof of insurance, and pay any required fees.
Once you have passed both tests and met all other requirements, the Ohio BMV will add the CDL Doubles/Triples endorsement to your existing CDL license. It is important to note that if your CDL license is due for renewal soon, you may want to renew it with the endorsement added instead of adding it separately.
Firstly, to operate a commercial vehicle with double or triple trailers attached, you must hold a valid CDL Doubles/Triples endorsement. You must also comply with all other requirements and regulations related to operating a commercial vehicle, such as hours of service, weight restrictions, and safety regulations.
Additionally, there are certain restrictions on the length and weight of the commercial vehicle you can operate with double or triple trailers. In Ohio, the maximum length limit for a combination of vehicles with double or triple trailers is 65 feet. The maximum gross weight limit is 80,000 pounds.
It is also important to note that some states may have different restrictions and limitations on operating commercial vehicles with double or triple trailers. If you plan on driving in other states, you should check their specific regulations and requirements before operating a commercial vehicle with multiple trailers attached.
1. Proper weight distribution: It is important to ensure that the weight of the cargo is properly distributed in all trailers to prevent tipping or instability.
2. Adequate stopping distance: The stopping distance for a combination of vehicles with double or triple trailers is longer than for a single vehicle, so it is important to maintain a safe following distance and brake early.
3. Wider turns: The length and weight of the combination vehicle with double or triple trailers can make turning more difficult, so it is important to take wider turns and be aware of the trailer swing.
4. Increased blind spots: The length of the combination vehicle with double or triple trailers can create more blind spots, so it is important to use mirrors and turn signals effectively.
5. Proper trailer hookup: It is important to ensure that all trailers are properly attached and secured before driving.
6. Compliance with state and federal regulations: Drivers must comply with all state and federal regulations related to operating commercial vehicles, including hours of service, weight restrictions, and safety regulations.
By following these safety considerations and regulations, drivers with a CDL Doubles/Triples endorsement can help ensure safe operation of commercial vehicles with multiple trailers attached.