If you need to back your trailer but cannot back up in a straight path, you should back on a curved path toward the driver's side of the vehicle. This will permit you the best possible visibility while backing.

Back toward the passenger's side.

Swerve back and forth while backing.

To test the trailer service brakes, you should first ensure that the braking system has a normal air pressure level, then release the parking brake. You should then move the vehicle forward slowly and apply the brakes with the hand control. If the trailer service brakes are working properly, you will feel the brakes activate.

Move the vehicle forward slowly and apply the brakes with the hand control.

Move the vehicle forward slowly and apply the brakes with the brake pedal.

Reverse the vehicle slowly and apply the brakes with the hand control.

Reverse the vehicle slowly and apply the brakes with the brake pedal.

Move the vehicle forward slowly and apply the brakes with the hand control.

In vehicles equipped with an automatic tractor protection valve, the valve will pop out if air pressure drops to a level between 20 and 45 psi. When the valve pops out, the protection valve will close, stopping the flow of air.

Air pressure drops to a level between 20 and 45 psi.

You are experiencing a trailer jackknife.

Wheels have regained traction after a skid.

The function of an Anti-Lock Braking System (ABS) is to prevent a vehicle's wheels from locking up during hard braking.

Prevents wheels from locking up.

Makes it easier to turn a large vehicle.

Assists with the operation of brake lights.

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.

Combination Vehicles Practice Test | Colorado 2024 #2

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 #2

1 . If you need to back your trailer but cannot back up in a straight path, you should:

2 . To test the trailer service brakes, you should:

3 . In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when:

4 . An Anti-Lock Braking System (ABS):

5 . To prevent a rollover, a driver should:

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

7 . Fully-loaded rigs:

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