Tractor protection controls in older vehicles may be operated by levers instead of knobs. If an air supply control is set in its "normal" position, it is properly set for you to pull a trailer.

Applying the trailer emergency brakes.

Because the weight of cargo gives them a higher center of gravity, fully-loaded rigs are 10 times more likely to roll over in a crash than empty rigs.

Are more likely to roll over than empty rigs.

Are less likely to roll over than empty rigs.

Are more likely to roll over than empty rigs.

Are just as likely to roll over as empty rigs.

In a combination vehicle with air brakes, the tractor protection valve keeps air in the tractor or truck brake system in the event of the trailer breaking away or developing a leak.

A valve to keep air in the brake system should there be a bad leak

A valve that prevents the truck from being stolen

A valve that prevents the driver from going too fast

A valve that prevents the trailer from accidentally being released

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 | Colorado 2024 #1

Train for FREE online with our Colorado 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 CO 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 | Colorado 2024 #1

1 . Before backing your tractor under the trailer, make sure your trailer brakes are:

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

3 . Rollovers happen when drivers:

4 . An air supply control lever should be in its "normal" position when you are:

5 . Fully-loaded rigs:

6 . What is a tractor protection valve?

7 . Simply changing lanes can cause:

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