Combination Vehicles Practice Test | Washington 2024 #2

Train for FREE online with our Washington CDL combination vehicle test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a WA combination license in 2024, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that DMV requirements for issuing a combination license may vary from state to state.

Number of Question 20

Passing Score 16

Number of Tests 20

1 . When coupling, after you've connected the air lines to the trailer, you should:

Supply air to the trailer.

Activate the emergency brake.

Disconnect the glad hands.

Correctly following the steps to couple and uncouple trailers is vital to safely operating a combination vehicle. After connecting the air lines to the trailer while coupling, you should supply air to the trailer.

2 . If the emergency air line loses pressure:

The service brakes will activate.

The tractor protection valve will close.

The rear trailer will detach from the combination.

The tractor protection valve keeps air in the trailer's braking system should the trailer break away or develop a leak. A loss of air pressure in the emergency line will cause the tractor protection valve to open and the emergency trailer brakes to activate.

3 . The best way to recognize that your trailer has started to skid is by:

Seeing other drivers' faces.

Checking the trailer in your mirrors.

Feeling the trailer move.

The easiest way to become aware that your trailer has begun to jackknife is to observe it in your mirrors. Checking your trailer in your mirrors will also allow you to spot any skidding at the earliest possible moment.

4 . A driver should test the tractor protection valve by:

Pulling the yellow, diamond-shaped knob.

Releasing air with the brake pedal.

Unlocking the trailer doors.

You should test the tractor protection valve by allowing the air supply to properly charge, turning off the engine, then releasing air from the system by pressing the brake pedal several times. The tractor protection valve should move into its emergency position when psi drops to an unsafe level.

5 . The trailer hand valve should be used:

To test the trailer brakes.

To check the connection between the trailer and tractor.

To accelerate.

The trailer hand valve (also referred to as the "trolley valve" or "Johnson bar") works the trailer brakes and should be used only when testing them. Using the trailer hand valve while driving could result in a skid.

6 . If a trailer begins to jackknife, the driver:

Should not apply the trailer hand brake.

Should firmly apply the brakes.

Can straighten the trailer with the parking brake.

If a trailer begins to jackknife, you should release the brakes and allow the trailer wheels to regain traction with the road. Do not apply the trailer hand brake to attempt to straighten out the rig because the application of brakes is what caused the wheels to lock in the first place.

7 . How much space should be between the upper and lower fifth wheel?

About five inches of space

A maximum of two inches of space

No space

Before a trip, be sure to inspect all couplings. There should be no space between the upper and lower fifth wheel.

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2024 Washington | Frequently Asked Questions

To secure a CDL Doubles/Triples endorsement in Washington, you must first possess a valid CDL. Then, you should study the Doubles and Triples section of the Washington CDL Handbook. After studying, schedule and pass the written knowledge test at a Washington Department of Licensing office. Lastly, pay the required endorsement fee to add it to your license.

To obtain a CDL Doubles/Triples license, you must first have a basic CDL. You will then need to study for and pass the Doubles/Triples endorsement test, which covers specific knowledge related to driving these types of vehicles. This includes understanding the handling and safety procedures. Finally, you'll pay any required fees for the additional endorsement on your license.

While formal experience isn't required for a CDL Doubles/Triples endorsement, you must possess a valid Commercial Driver's License (CDL). It's recommended to study the CDL manual and take practice tests. Understanding coupling/uncoupling, inspecting doubles/triples, and checking air brakes is essential. Passing the Doubles/Triples endorsement knowledge test is the final step.

Yes, to obtain a CDL Doubles/Triples endorsement, you must pass the Doubles/Triples endorsement knowledge test. This test covers topics like coupling and uncoupling, inspecting doubles and triples, and checking air brakes. There is no additional driving skills test required beyond the standard CDL exam.

The CDL Doubles/Triples endorsement test primarily focuses on knowledge rather than specific driving maneuvers. You'll need to understand coupling and uncoupling, inspecting doubles and triples, and managing the high risk of rollover. Additionally, you'll need to know about pulling double/triple trailers, as well as the implications of crashes. The test is written, not practical, so no driving skills are showcased.

No, it is not permissible. In Washington, like in all states, a valid CDL Doubles/Triples endorsement is required to legally operate double or triple trailers. Driving these vehicles without the necessary endorsement can lead to serious penalties including fines and suspension of your commercial driving license.

You can append the Doubles/Triples endorsement to your existing CDL. You don't need to initiate a new application for a CDL. However, you must pass the Doubles/Triples knowledge test. Once you pass, the endorsement is added to your CDL, allowing you to legally operate double and triple trailers.

Yes, there are limitations for drivers with a CDL Doubles/Triples endorsement. They can only operate double or triple trailers. Also, these drivers must comply with all federal and state regulations regarding commercial vehicle operation, including weight limits, logbook rules, and safety inspections. Any violation can lead to penalties or revocation of the endorsement.

In Washington State, double trailers can't exceed a combined length of 61 feet and triple trailers can't exceed 75 feet. As for weight, the maximum gross vehicle weight (including all axles) is 105,500 pounds. However, individual axle weights can't exceed limits set by federal bridge laws. Always check specific state and federal regulations.

Yes, there are specific safety guidelines and regulations for driving double/triple trailers with a CDL Doubles/Triples endorsement in Washington. These include maintaining proper spacing between trailers, using proper turning techniques, and adhering to weight restrictions. It is important to follow these guidelines to ensure the safe operation of double/triple trailers on the road.