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.

To reduce the risk of tipping over when driving with a trailer, you should steer gently and smoothly. Avoid making sudden movements.

Accelerate by pushing the accelerator to the floor.

When driving a tractor-trailer combination equipped with an Anti-Lock Braking System (ABS), you should brake in the same manner that you would in a vehicle without ABS.

Stop harder than you would otherwise.

Use extra braking force to ensure the ABS kicks in.

Brake using less pressure than you would otherwise use.

If you are unsure of your path while you are driving in reverse, you should stop, exit the vehicle, and recheck your path of travel.

Continue backing, but more slowly than before.

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.

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.

Combination Vehicles Practice Test | South Dakota 2025 #2

Train for FREE online with our South 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 SD 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 | South Dakota 2025 #2

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

2 . When driving with trailers, you should:

3 . When driving a tractor-trailer equipped with ABS, you should:

4 . If you are backing and become unsure about your path of travel, you should:

5 . Combination vehicles:

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

7 . If color-coded, which color is used to identify service lines?

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