# 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 15 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 15 multiple choice questions. Each question has three answer choices. To pass, the applicant must answer at least 12 questions correctly. Test questions come from the California Commercial Driver 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

### 1. In a dual air brake system, air pressure should build from 85 to 100 psi within ____ seconds.

Explanation
When inspecting a vehicle with a dual air brake system, you should wait for air pressure to build from 85 to 100 psi in both the primary and secondary systems. This should take about 45 seconds.

### 2. What happens when a vehicle hydroplanes?

Explanation
On a wet road, it is possible for a vehicle's tires to lose traction with the road surface and begin to glide along on the layer of water. This is referred to as hydroplaning. Hydroplaning can occur at speeds as low as 30 mph.

### 3. A driver who stops at a green light could be:

Explanation
It is important to observe other drivers' actions and identify clues that a person could be driving impaired. Drivers who have had too much to drink, are sleepy, are on drugs, or are ill can present hazards to other drivers. One sign that a driver may be impaired is that they stop in inappropriate places, such as at green traffic lights.

### 4. How can you check for a leak in hydraulic brakes?

Explanation
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.

### 5. As part of a pre-trip inspection, you should look for all of the following, except:

Explanation
When inspecting your tires, verify that there is tread depth of at least 4/32 of an inch in every major groove on the front tires and tread depth of at least 2/32 of an inch in grooves on the other tires. Be sure that your tires are not too worn, are not cracked, have proper air pressure, and are all equally sized.

To get a CDL Doubles/Triples endorsement in California, you must follow these steps:

1. Obtain a California CDL: You must have a valid California Commercial Driver's License (CDL) before you can apply for a Doubles/Triples endorsement.

2. Pass the CDL Doubles/Triples knowledge test: The next step is to pass the written test for the Doubles/Triples endorsement. You can prepare for the test by studying the California Commercial Driver Handbook.

3. Schedule a DMV appointment: After passing the knowledge test, schedule an appointment with your local DMV office. You can make an appointment online or by calling their customer service line.

4. Pay the fee: There is a fee for adding a Doubles/Triples endorsement to your CDL. You can pay this fee at the DMV when you take your skills test.

5. Pass the CDL Doubles/Triples skills test: During your DMV appointment, you will need to take a skills test that includes a pre-trip inspection and a driving test using a vehicle with doubles/triples attached.

Remember to bring all necessary documents and identification to your DMV appointment, including your current CDL and proof of insurance for any vehicle you plan to use during your skills test.
To get a CDL Doubles/Triples license in California, you must meet the following requirements:

1. Age: You must be at least 18 years old to drive intrastate (within California) or 21 years old to drive interstate (across state lines).

2. Valid CDL: You must have a valid California Commercial Driver's License (CDL) before you can apply for a Doubles/Triples endorsement.

3. Clean driving record: You must have a clean driving record, with no serious traffic violations or DUI convictions in the past three years.

4. Medical certification: You must pass a medical examination and obtain a medical certificate from a certified medical examiner.

5. Pass the CDL Doubles/Triples knowledge test: You must pass the written test for the Doubles/Triples endorsement, which covers safety regulations and procedures specific to driving vehicles with doubles/triples.

6. Pass the CDL Doubles/Triples skills test: You must pass a skills test that includes a pre-trip inspection and a driving test using a vehicle with doubles/triples attached.

7. Pay the fee: There is a fee for adding a Doubles/Triples endorsement to your CDL.

Additionally, you may need to provide proof of residency in California and proof of insurance for any vehicle you plan to use during your skills test.
Yes, before you can obtain a CDL Doubles/Triples endorsement in California, you must have some specific experience or training.

The Federal Motor Carrier Safety Administration (FMCSA) requires that you have experience operating a commercial motor vehicle (CMV) with a single trailer before you can operate a CMV with doubles/triples. Therefore, to obtain a Doubles/Triples endorsement, you must have at least one year of experience driving a CMV with a single trailer.

In addition to experience, it is highly recommended that you receive specific training on how to operate a CMV with doubles/triples. This training should cover topics such as proper coupling and uncoupling procedures, handling characteristics of doubles/triples, and driving techniques for safe operation.

You can receive this training from a qualified driving school or from your employer if you work for a trucking company. You may also consider taking additional courses or obtaining certifications related to driving commercial vehicles to improve your skills and knowledge.
Yes, in California, you need to pass an additional written test to obtain a CDL Doubles/Triples endorsement.

The test covers topics specific to driving with double or triple trailers, such as coupling and uncoupling procedures, weight distribution, and the use of air brakes. You must pass this test to obtain the endorsement.

In addition to the written test, you will also need to pass a skills test that specifically evaluates your ability to operate a CMV with doubles/triples. This skills test includes a pre-trip inspection of the vehicle and a driving test that evaluates your ability to handle the increased length and weight of the vehicle.

It is important to note that you must already have a valid CDL before you can take the written and skills tests for the Doubles/Triples endorsement. Furthermore, you must also have at least one year of experience driving a commercial motor vehicle with a single trailer before you can apply for the Doubles/Triples endorsement.
During the CDL Doubles/Triples endorsement test, you will be evaluated on your ability to perform specific skills or maneuvers that are necessary for safely operating a commercial motor vehicle (CMV) with double or triple trailers. Here are some of the skills or maneuvers you may be asked to perform:

1. Pre-trip inspection: You will need to demonstrate your ability to perform a thorough pre-trip inspection of the CMV and its double or triple trailers, identifying any issues that could impact the safety of the vehicle or its cargo.

2. Coupling and uncoupling: You will need to demonstrate your ability to properly couple and uncouple double or triple trailers, including checking that all connections are secure and performing air brake tests to ensure that the brake system is functioning properly.

3. Straight line backing: You will need to demonstrate your ability to safely back up a CMV with double or triple trailers in a straight line for a distance of at least 100 feet.

4. Off-set backing: You will need to demonstrate your ability to safely back up a CMV with double or triple trailers in an off-set configuration, where the trailer is positioned at an angle to the tractor.

5. Parallel parking: You will need to demonstrate your ability to safely parallel park a CMV with double or triple trailers, positioning the vehicle within a designated space without hitting any obstacles.

6. Turning and merging: You will need to demonstrate your ability to safely navigate turns and merge onto highways while driving a CMV with double or triple trailers, considering the increased length and weight of the vehicle.

These are just some examples of the skills and maneuvers you may be asked to perform during the CDL Doubles/Triples endorsement test. The specific requirements may vary depending on the state and testing location.
No, you cannot legally operate a commercial motor vehicle (CMV) with double or triple trailers without a CDL Doubles/Triples endorsement. In California, this endorsement is required for drivers who want to operate a CMV with multiple trailers, including combination vehicles with two or three trailers.

The Doubles/Triples endorsement is an additional knowledge and skills test that drivers must pass in addition to the general CDL knowledge and skills tests. Without this endorsement, a driver is not authorized to operate a CMV with double or triple trailers, even if they hold a valid CDL.

It is important to note that driving a CMV with double or triple trailers requires additional skills and knowledge compared to driving a single trailer. The additional weight and length of the vehicle can make it more difficult to maneuver, especially in tight spaces. The Doubles/Triples endorsement ensures that drivers have the necessary skills and knowledge to handle these types of vehicles safely.
You can add the CDL Doubles/Triples endorsement to your existing CDL license in California by passing the required knowledge and skills tests. You do not need to apply for a new license.

To add the Doubles/Triples endorsement, you will need to pass a written knowledge test and a skills test that specifically evaluates your ability to safely operate a commercial motor vehicle (CMV) with double or triple trailers. You will also need to provide proof of your identity, residency, and legal presence in the United States.

Once you have passed the required tests and provided all necessary documentation, the California Department of Motor Vehicles (DMV) will add the Doubles/Triples endorsement to your existing CDL license. You will receive a new license with the endorsement added.

It is important to note that adding an endorsement may come with additional fees. The exact fees may vary depending on your location and other factors. It is recommended that you check with your local DMV office for specific fee information.
Yes, there are restrictions and limitations for drivers with a CDL Doubles/Triples endorsement in California. These restrictions are in place to ensure the safety of the driver and others on the road.

One restriction is that drivers with a Doubles/Triples endorsement are not allowed to operate triple trailers on California highways. Additionally, drivers with a Doubles/Triples endorsement must have a minimum age of 21 years old to operate a CMV with double or triple trailers.

Another restriction is that drivers with a Doubles/Triples endorsement must always ensure that the trailers are properly connected and secured. They must also make sure that the trailers do not exceed weight and length limits set by law.

Drivers with a Doubles/Triples endorsement must also be aware of their surroundings at all times, especially when turning or changing lanes. The additional length and weight of the vehicle can make it more difficult to maneuver, and drivers must exercise caution to avoid accidents.

It is important for drivers with a Doubles/Triples endorsement to always be aware of any other restrictions or requirements that may apply, as these can vary depending on the state in which they are driving.
In California, there are specific weight and length limits for double and triple trailers that drivers with a CDL Doubles/Triples endorsement must comply with.

The maximum weight limit for double and triple trailers is 80,000 pounds. However, the weight distribution between the axles of the tractor and trailers must be in compliance with the state's weight laws.

The maximum length limit for double trailers is 28 feet for each trailer, or a total of 56 feet overall. For triple trailers, the maximum length limit is 28 feet for each trailer, or a total of 75 feet overall.

It is important to note that different states may have different weight and length limits for double and triple trailers. Drivers with a CDL Doubles/Triples endorsement should always be aware of the specific regulations in the states in which they are operating their commercial vehicles.
Yes, there are specific safety considerations and regulations for driving double/triple trailers with a CDL Doubles/Triples endorsement to ensure the safety of the driver and other road users. Some of these considerations and regulations include:

1. Properly securing cargo: Drivers with a CDL Doubles/Triples endorsement must ensure that the cargo they are hauling is properly secured to prevent it from shifting or falling off the trailers during transit.

2. Checking brakes and lighting: It is important for drivers to regularly check the brakes and lighting systems of their double/triple trailers to ensure that they are in good working condition.

3. Maintaining safe following distances: Due to the increased length of double/triple trailers, it is important for drivers to maintain safe following distances to allow themselves enough time and space to react in case of an emergency.

4. Making wider turns: Drivers should make wider turns when driving double/triple trailers to ensure that their vehicles do not swing into other lanes or hit curbs or other objects.

5. Avoiding high winds and inclement weather: Double/triple trailers can be more difficult to control in high winds or inclement weather conditions, so drivers with a CDL Doubles/Triples endorsement should avoid driving in such conditions whenever possible.

6. Obeying weight and length limits: Drivers must ensure that their double/triple trailers do not exceed the weight and length limits set by law.

7. Staying alert and focused: Driving double/triple trailers can be more challenging than driving standard commercial vehicles, so it is important for drivers to stay alert, focused, and well-rested at all times.