To lower the risk of a rollover, load your cargo as closely to the ground as possible. To further reduce this risk, take curves and corners slowly.

Load the cargo as low as possible.

Load the cargo as far forward as possible.

Load the cargo as far back as possible.

Load the cargo as low as possible.

Stack the cargo as high as possible.

The emergency air line controls the emergency brakes on a combination vehicle. A loss of air pressure in the emergency line will cause the emergency trailer brakes to activate.

The emergency brakes to activate.

The suspension springs to extend.

The tractor protection valve to open.

The rear trailer to detach from the combination.

The emergency brakes to activate.

Combination vehicles are usually heavier and longer than single commercial vehicles. For these reasons, they usually require more driving skill than single commercial vehicles.

Require more skill to drive than single commercial vehicles.

Are usually shorter than single commercial vehicles.

Are usually lighter than single commercial vehicles.

Require more skill to drive than single commercial vehicles.

Are easier to drive than single commercial vehicles.

When positioning trailers in a combination, the most heavily-loaded trailer should be the closest to the tractor. The lightest trailer should be positioned in the rear.

The heaviest trailer should be positioned directly behind the cab.

Cargo weight must be evenly distributed between all trailers.

The heaviest trailer should be positioned directly behind the cab.

The heaviest trailer should be positioned in the rear.

The weight of the trailers does not matter.

Due to the "crack-the-whip" effect caused by rearward amplification, changing lanes too quickly in a combination vehicle can result in a rollover.

A “crack-the-whip” effect, resulting in a rollover.

Confusion over which lane the driver is hoping to use.

Other drivers to reduce their speed.

Combination Vehicles Practice Test | North Dakota 2025 #1

Train for FREE online with our North Dakota 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 ND 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

Combination Vehicles Practice Test | North Dakota 2025 #1

1 . To lower the risk of a rollover, you should:

2 . A loss of air pressure in the emergency line will cause:

3 . Combination vehicles:

4 . A combination vehicle has:

5 . In a double or triple combination:

6 . Using the trailer hand brake while experiencing a trailer jackknife will:

7 . Simply changing lanes can cause:

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