Driving combination vehicles requires more skill than driving single commercial vehicles. Combinations are generally longer, generally heavier, and are more vulnerable to rollover.

Require more skill to drive than single commercial vehicles.

Often have taller trailers than single commercial vehicles.

Are usually lighter than single commercial vehicles.

Require more skill to drive than single commercial vehicles.

Vehicles with trailers are vulnerable to rollover due to the "crack-the-whip" effect, which is caused by rearward amplification.

The cause of the "crack-the-whip" effect.

The amount of noise projected to the rear of a vehicle.

The cause of the "crack-the-whip" effect.

The number of trailers that can be pulled by a tractor.

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

A maximum of two inches of space

Combination Vehicles Practice Test | Idaho 2024 #1

Train for FREE online with our Idaho 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 ID 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

Combination Vehicles Practice Test | Idaho 2024 #1

1 . In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when air pressure drops to a level between:

2 . Combination vehicles:

3 . When connecting a converter dolly to a second trailer, the trailer height should be ____ the center of the fifth wheel.

4 . Rearward amplification refers to:

5 . Trailers built before ____ are not required to have spring brakes.

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

7 . The service air line is often controlled by the foot brake and is attached to the ____ valves.

See the exact questions that will be on the 2024 DMV exam.

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