Combination Vehicles Practice Test | Hawaii 2025 #1

Train for FREE online with our Hawaii 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 HI combination license in 2025, 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 . More than half of all accident-related truck driver deaths are caused by:

Rollovers.

Slippery roads.

Other drivers.

More than half of all accident-related truck driver deaths are a result of truck rollovers. To help prevent a rollover, be sure to load cargo low to the ground and centered on your rig. Take corners slowly and carefully.

2 . If you press the tractor air supply control and your trailer's spring brakes do not release, you should:

Inspect the air line connections.

Activate the Anti-Lock Braking System.

Turn the engine off and on again.

It is important that all of a vehicle's equipment is in proper working condition before beginning a trip. If a trailer's spring brakes do not release when you push in the tractor air supply control, you should make sure the air line connections are properly attached and sealed.

3 . 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.

4 . Place the trailer air supply control in its "emergency" position to test:

The trailer emergency brakes.

A coupling device.

The anti-lock brakes.

Be sure to test the trailer emergency brakes before beginning a trip. After ensuring that the trailer rolls freely, you can test the emergency brakes by pulling out the trailer air supply control, or placing it in the "emergency" position. Pull forward slightly with the tractor and make sure the trailer does not move.

5 . If a trailer begins to skid, it is best for the driver to:

Release the brakes.

Accelerate.

Quickly turn the steering wheel in one direction, then in the other.

If your trailer begins to skid, you should release the brakes to regain traction. The trailer will begin to straighten out once the wheels begin to grip the road again.

6 . Watching the road ahead:

Is more dangerous than only watching your mirrors.

Does not help you drive more safely.

Can help you avoid the need for sudden lane changes.

Making a sudden lane change can be dangerous while driving a combination vehicle. You can avoid the need to make a sudden lange change by looking down the road for upcoming obstacles that will require you to change lanes.

7 . If you must cross traffic while driving a combination vehicle, you should:

Assume other drivers will make room for your vehicle.

Wait for a gap large enough for your vehicle to safely cross.

Rely only on your mirrors.

Combination vehicles require more space on the road than other vehicles. When entering or crossing traffic while driving a combination vehicle, it is especially important that there is a large enonugh gap in traffic to safely do so.

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2025 Hawaii | Frequently Asked Questions

To secure a CDL Doubles/Triples endorsement in Hawaii, you first need a valid Hawaii CDL. Then, study the Hawaii CDL Manual's section on Doubles and Triples. Schedule and pass the written knowledge test at a local DMV office. The test covers information regarding coupling and uncoupling, inspecting doubles and triples, and handling these vehicles.

To obtain a CDL Doubles/Triples license, you first need a valid Commercial Driver's License (CDL). Then, you must study the relevant sections of the CDL manual, focusing on handling and inspecting doubles and triples. After studying, schedule and pass the written knowledge test at your local DMV. This test covers coupling and uncoupling, inspecting, and handling these types of vehicles.

While no specific prior experience is mandated for a CDL Doubles/Triples endorsement, it's crucial to thoroughly study the relevant sections in the CDL manual. This prepares you for the written knowledge test at your local DMV. Practical training or experience driving these vehicles can be beneficial, but it's not a pre-requisite. The key is passing the knowledge test.

Yes, to obtain a CDL Doubles/Triples endorsement, you must pass an additional written knowledge test. This test focuses on specifics of handling and inspecting double and triple trailers. The content for the test can be found in the CDL manual, particularly in sections dealing with coupling/uncoupling and inspecting these types of vehicles.

The CDL Doubles/Triples endorsement test in Hawaii is a written examination, not a skills test. It will cover knowledge on coupling and uncoupling, inspecting doubles and triples, and checking air brakes. However, you won't need to perform any specific maneuvers or showcase driving skills. It's advisable to study the Hawaii CDL manual thoroughly before taking the test.

No, it's not permissible. Operating double or triple trailers requires a valid CDL with a Doubles/Triples endorsement. This endorsement signifies that you've passed the required knowledge test and are competent to handle these types of vehicles. Without it, you're legally not allowed to drive double or triple trailers in Hawaii or any other state.

Yes, you can append the CDL Doubles/Triples endorsement to your current license. You don't need to initiate a new application for the entire license. However, you will need to pass the Doubles/Triples knowledge test and pay any associated fees. Once you've successfully completed these steps, the endorsement will be added to your existing CDL.

Yes, there are constraints for drivers with a CDL Doubles/Triples endorsement in Hawaii. The driver must be at least 21 years old to drive interstate. Also, they must have a clean driving record, pass a medical examination every two years, and complete required training. Furthermore, the endorsement only allows for the operation of doubles and triples trailers, not other commercial vehicles unless specified on the CDL.

In Hawaii, the maximum legal weight for a vehicle is 80,000 pounds. The maximum length for a double trailer is 61 feet for the two trailers, but the overall length of the truck and trailers combined is not to exceed 65 feet. Triple trailers are not allowed in Hawaii. Always check specific state regulations as they can vary.

Yes, drivers with a CDL Doubles/Triples endorsement must follow specific safety guidelines. These include proper coupling and uncoupling of units, inspecting the coupling system regularly, maintaining safe following distance, and understanding the high rollover risk. They must also be aware of the "crack-the-whip" effect, which can cause the last trailer to swing out and potentially tip over.